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Finding the Fourth Proportional to 87,179, 130,787.94 and 31,775

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Solution

The fourth proportional to 87,179, 130,787.94 and 31,775 is: 47,669.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,179 : 130,787.94 = 31,775 : x
  2. Step 2: Convert to fraction form
    87,179/130,787.94 = 31,775/x
  3. Step 3: Cross multiply
    87,179x = 130,787.94 × 31,775
  4. Step 4: Simplify right side
    87,179x = 4,155,786,793.50
  5. Step 5: Solve for x
    x = 4,155,786,793.50/87,179
  6. Step 6: Final answer
    x = 47,669.59

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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.