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Finding the Fourth Proportional to 72,631.71, 100,000.04 and 61,978.59

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Solution

The fourth proportional to 72,631.71, 100,000.04 and 61,978.59 is: 85,332.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,631.71 : 100,000.04 = 61,978.59 : x
  2. Step 2: Convert to fraction form
    72,631.71/100,000.04 = 61,978.59/x
  3. Step 3: Cross multiply
    72,631.71x = 100,000.04 × 61,978.59
  4. Step 4: Simplify right side
    72,631.71x = 6,197,861,169.25
  5. Step 5: Solve for x
    x = 6,197,861,169.25/72,631.71
  6. Step 6: Final answer
    x = 85,332.72

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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.