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Finding the Fourth Proportional to 22,720, 31,355.52 and 12,785.92

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Solution

The fourth proportional to 22,720, 31,355.52 and 12,785.92 is: 17,645.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,720 : 31,355.52 = 12,785.92 : x
  2. Step 2: Convert to fraction form
    22,720/31,355.52 = 12,785.92/x
  3. Step 3: Cross multiply
    22,720x = 31,355.52 × 12,785.92
  4. Step 4: Simplify right side
    22,720x = 400,909,170.28
  5. Step 5: Solve for x
    x = 400,909,170.28/22,720
  6. Step 6: Final answer
    x = 17,645.65

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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.