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Finding the Fourth Proportional to 268,251.80, 402,431.70 and 78,711.80

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Solution

The fourth proportional to 268,251.80, 402,431.70 and 78,711.80 is: 118,083.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,251.80 : 402,431.70 = 78,711.80 : x
  2. Step 2: Convert to fraction form
    268,251.80/402,431.70 = 78,711.80/x
  3. Step 3: Cross multiply
    268,251.80x = 402,431.70 × 78,711.80
  4. Step 4: Simplify right side
    268,251.80x = 31,676,123,484.06
  5. Step 5: Solve for x
    x = 31,676,123,484.06/268,251.80
  6. Step 6: Final answer
    x = 118,083.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.