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Finding the Fourth Proportional to 85,737.39, 128,578.82 and 80,140.11

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Solution

The fourth proportional to 85,737.39, 128,578.82 and 80,140.11 is: 120,184.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,737.39 : 128,578.82 = 80,140.11 : x
  2. Step 2: Convert to fraction form
    85,737.39/128,578.82 = 80,140.11/x
  3. Step 3: Cross multiply
    85,737.39x = 128,578.82 × 80,140.11
  4. Step 4: Simplify right side
    85,737.39x = 10,304,320,778.47
  5. Step 5: Solve for x
    x = 10,304,320,778.47/85,737.39
  6. Step 6: Final answer
    x = 120,184.68

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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.