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Finding the Fourth Proportional to 30,718.98, 42,392.16 and 17,980.92

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Solution

The fourth proportional to 30,718.98, 42,392.16 and 17,980.92 is: 24,813.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,718.98 : 42,392.16 = 17,980.92 : x
  2. Step 2: Convert to fraction form
    30,718.98/42,392.16 = 17,980.92/x
  3. Step 3: Cross multiply
    30,718.98x = 42,392.16 × 17,980.92
  4. Step 4: Simplify right side
    30,718.98x = 762,250,037.59
  5. Step 5: Solve for x
    x = 762,250,037.59/30,718.98
  6. Step 6: Final answer
    x = 24,813.65

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Half scale
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Double scale
Find fourth proportional to 30,719.98, 42,393.54 and 17,981.92
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.