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Finding the Fourth Proportional to 72,686.61, 109,028.54 and 39,617.12

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Solution

The fourth proportional to 72,686.61, 109,028.54 and 39,617.12 is: 59,424.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,686.61 : 109,028.54 = 39,617.12 : x
  2. Step 2: Convert to fraction form
    72,686.61/109,028.54 = 39,617.12/x
  3. Step 3: Cross multiply
    72,686.61x = 109,028.54 × 39,617.12
  4. Step 4: Simplify right side
    72,686.61x = 4,319,397,124.22
  5. Step 5: Solve for x
    x = 4,319,397,124.22/72,686.61
  6. Step 6: Final answer
    x = 59,424.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.