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Finding the Fourth Proportional to 100,972.92, 139,350.64 and 55,658.96

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Solution

The fourth proportional to 100,972.92, 139,350.64 and 55,658.96 is: 76,813.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,972.92 : 139,350.64 = 55,658.96 : x
  2. Step 2: Convert to fraction form
    100,972.92/139,350.64 = 55,658.96/x
  3. Step 3: Cross multiply
    100,972.92x = 139,350.64 × 55,658.96
  4. Step 4: Simplify right side
    100,972.92x = 7,756,111,697.73
  5. Step 5: Solve for x
    x = 7,756,111,697.73/100,972.92
  6. Step 6: Final answer
    x = 76,813.78

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1.5x scale

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.