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Finding the Fourth Proportional to 112,728, 155,564.69 and 62,427

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Solution

The fourth proportional to 112,728, 155,564.69 and 62,427 is: 86,149.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,728 : 155,564.69 = 62,427 : x
  2. Step 2: Convert to fraction form
    112,728/155,564.69 = 62,427/x
  3. Step 3: Cross multiply
    112,728x = 155,564.69 × 62,427
  4. Step 4: Simplify right side
    112,728x = 9,711,436,590.50
  5. Step 5: Solve for x
    x = 9,711,436,590.50/112,728
  6. Step 6: Final answer
    x = 86,149.28

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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.