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Finding the Fourth Proportional to 85,939.70, 128,800.20 and 41,470.70

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Solution

The fourth proportional to 85,939.70, 128,800.20 and 41,470.70 is: 62,153.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,939.70 : 128,800.20 = 41,470.70 : x
  2. Step 2: Convert to fraction form
    85,939.70/128,800.20 = 41,470.70/x
  3. Step 3: Cross multiply
    85,939.70x = 128,800.20 × 41,470.70
  4. Step 4: Simplify right side
    85,939.70x = 5,341,434,454.14
  5. Step 5: Solve for x
    x = 5,341,434,454.14/85,939.70
  6. Step 6: Final answer
    x = 62,153.28

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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.