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Finding the Fourth Proportional to 115,410.57, 172,660.37 and 87,411.30

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Solution

The fourth proportional to 115,410.57, 172,660.37 and 87,411.30 is: 130,771.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,410.57 : 172,660.37 = 87,411.30 : x
  2. Step 2: Convert to fraction form
    115,410.57/172,660.37 = 87,411.30/x
  3. Step 3: Cross multiply
    115,410.57x = 172,660.37 × 87,411.30
  4. Step 4: Simplify right side
    115,410.57x = 15,092,466,963.12
  5. Step 5: Solve for x
    x = 15,092,466,963.12/115,410.57
  6. Step 6: Final answer
    x = 130,771.96

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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.