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Finding the Fourth Proportional to 123,074.40, 169,844.85 and 72,123.78

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Solution

The fourth proportional to 123,074.40, 169,844.85 and 72,123.78 is: 99,532.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,074.40 : 169,844.85 = 72,123.78 : x
  2. Step 2: Convert to fraction form
    123,074.40/169,844.85 = 72,123.78/x
  3. Step 3: Cross multiply
    123,074.40x = 169,844.85 × 72,123.78
  4. Step 4: Simplify right side
    123,074.40x = 12,249,852,595.53
  5. Step 5: Solve for x
    x = 12,249,852,595.53/123,074.40
  6. Step 6: Final answer
    x = 99,532.09

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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.