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Finding the Fourth Proportional to 72,820.70, 100,472.90 and 42,613.50

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Solution

The fourth proportional to 72,820.70, 100,472.90 and 42,613.50 is: 58,795.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,820.70 : 100,472.90 = 42,613.50 : x
  2. Step 2: Convert to fraction form
    72,820.70/100,472.90 = 42,613.50/x
  3. Step 3: Cross multiply
    72,820.70x = 100,472.90 × 42,613.50
  4. Step 4: Simplify right side
    72,820.70x = 4,281,501,711.08
  5. Step 5: Solve for x
    x = 4,281,501,711.08/72,820.70
  6. Step 6: Final answer
    x = 58,795.12

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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.