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Finding the Fourth Proportional to 85,577.90, 128,123.85 and 80,923.10

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Solution

The fourth proportional to 85,577.90, 128,123.85 and 80,923.10 is: 121,154.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,577.90 : 128,123.85 = 80,923.10 : x
  2. Step 2: Convert to fraction form
    85,577.90/128,123.85 = 80,923.10/x
  3. Step 3: Cross multiply
    85,577.90x = 128,123.85 × 80,923.10
  4. Step 4: Simplify right side
    85,577.90x = 10,368,179,125.94
  5. Step 5: Solve for x
    x = 10,368,179,125.94/85,577.90
  6. Step 6: Final answer
    x = 121,154.87

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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.