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Finding the Fourth Proportional to 85,781.70, 128,672.55 and 79,949.70

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Solution

The fourth proportional to 85,781.70, 128,672.55 and 79,949.70 is: 119,924.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,781.70 : 128,672.55 = 79,949.70 : x
  2. Step 2: Convert to fraction form
    85,781.70/128,672.55 = 79,949.70/x
  3. Step 3: Cross multiply
    85,781.70x = 128,672.55 × 79,949.70
  4. Step 4: Simplify right side
    85,781.70x = 10,287,331,770.74
  5. Step 5: Solve for x
    x = 10,287,331,770.74/85,781.70
  6. Step 6: Final answer
    x = 119,924.55

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1.5x scale

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.