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Finding the Fourth Proportional to 85,815.75, 128,750.51 and 38,470.55

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Solution

The fourth proportional to 85,815.75, 128,750.51 and 38,470.55 is: 57,717.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,815.75 : 128,750.51 = 38,470.55 : x
  2. Step 2: Convert to fraction form
    85,815.75/128,750.51 = 38,470.55/x
  3. Step 3: Cross multiply
    85,815.75x = 128,750.51 × 38,470.55
  4. Step 4: Simplify right side
    85,815.75x = 4,953,102,384.90
  5. Step 5: Solve for x
    x = 4,953,102,384.90/85,815.75
  6. Step 6: Final answer
    x = 57,717.87

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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.