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Finding the Fourth Proportional to 72,309.86, 99,736.17 and 66,360.74

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Solution

The fourth proportional to 72,309.86, 99,736.17 and 66,360.74 is: 91,530.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,309.86 : 99,736.17 = 66,360.74 : x
  2. Step 2: Convert to fraction form
    72,309.86/99,736.17 = 66,360.74/x
  3. Step 3: Cross multiply
    72,309.86x = 99,736.17 × 66,360.74
  4. Step 4: Simplify right side
    72,309.86x = 6,618,566,045.97
  5. Step 5: Solve for x
    x = 6,618,566,045.97/72,309.86
  6. Step 6: Final answer
    x = 91,530.62

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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.