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Finding the Fourth Proportional to 72,407.67, 99,918.45 and 42,197.91

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Solution

The fourth proportional to 72,407.67, 99,918.45 and 42,197.91 is: 58,230.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,407.67 : 99,918.45 = 42,197.91 : x
  2. Step 2: Convert to fraction form
    72,407.67/99,918.45 = 42,197.91/x
  3. Step 3: Cross multiply
    72,407.67x = 99,918.45 × 42,197.91
  4. Step 4: Simplify right side
    72,407.67x = 4,216,349,760.44
  5. Step 5: Solve for x
    x = 4,216,349,760.44/72,407.67
  6. Step 6: Final answer
    x = 58,230.71

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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.