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Finding the Fourth Proportional to 30,651.62, 42,303.81 and 18,721.82

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Solution

The fourth proportional to 30,651.62, 42,303.81 and 18,721.82 is: 25,838.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,651.62 : 42,303.81 = 18,721.82 : x
  2. Step 2: Convert to fraction form
    30,651.62/42,303.81 = 18,721.82/x
  3. Step 3: Cross multiply
    30,651.62x = 42,303.81 × 18,721.82
  4. Step 4: Simplify right side
    30,651.62x = 792,004,316.13
  5. Step 5: Solve for x
    x = 792,004,316.13/30,651.62
  6. Step 6: Final answer
    x = 25,838.91

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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.