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Finding the Fourth Proportional to 87,130.70, 130,696.05 and 85,381.10

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Solution

The fourth proportional to 87,130.70, 130,696.05 and 85,381.10 is: 128,071.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,130.70 : 130,696.05 = 85,381.10 : x
  2. Step 2: Convert to fraction form
    87,130.70/130,696.05 = 85,381.10/x
  3. Step 3: Cross multiply
    87,130.70x = 130,696.05 × 85,381.10
  4. Step 4: Simplify right side
    87,130.70x = 11,158,972,514.66
  5. Step 5: Solve for x
    x = 11,158,972,514.66/87,130.70
  6. Step 6: Final answer
    x = 128,071.65

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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.