Home / 30,724.88-42,378.48-20,510.76

Finding the Fourth Proportional to 30,724.88, 42,378.48 and 20,510.76

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Solution

The fourth proportional to 30,724.88, 42,378.48 and 20,510.76 is: 28,290.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,724.88 : 42,378.48 = 20,510.76 : x
  2. Step 2: Convert to fraction form
    30,724.88/42,378.48 = 20,510.76/x
  3. Step 3: Cross multiply
    30,724.88x = 42,378.48 × 20,510.76
  4. Step 4: Simplify right side
    30,724.88x = 869,214,832.44
  5. Step 5: Solve for x
    x = 869,214,832.44/30,724.88
  6. Step 6: Final answer
    x = 28,290.26

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Half scale
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Double scale
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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.