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Finding the Fourth Proportional to 87,370.10, 131,055.15 and 85,912.10

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Solution

The fourth proportional to 87,370.10, 131,055.15 and 85,912.10 is: 128,868.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,370.10 : 131,055.15 = 85,912.10 : x
  2. Step 2: Convert to fraction form
    87,370.10/131,055.15 = 85,912.10/x
  3. Step 3: Cross multiply
    87,370.10x = 131,055.15 × 85,912.10
  4. Step 4: Simplify right side
    87,370.10x = 11,259,223,152.32
  5. Step 5: Solve for x
    x = 11,259,223,152.32/87,370.10
  6. Step 6: Final answer
    x = 128,868.15

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1.5x scale

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.