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Finding the Fourth Proportional to 66,602.80, 91,724.76 and 65,151.28

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Solution

The fourth proportional to 66,602.80, 91,724.76 and 65,151.28 is: 89,725.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,602.80 : 91,724.76 = 65,151.28 : x
  2. Step 2: Convert to fraction form
    66,602.80/91,724.76 = 65,151.28/x
  3. Step 3: Cross multiply
    66,602.80x = 91,724.76 × 65,151.28
  4. Step 4: Simplify right side
    66,602.80x = 5,975,985,521.69
  5. Step 5: Solve for x
    x = 5,975,985,521.69/66,602.80
  6. Step 6: Final answer
    x = 89,725.74

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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.