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Finding the Fourth Proportional to 86,715.80, 130,073.70 and 82,123.10

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Solution

The fourth proportional to 86,715.80, 130,073.70 and 82,123.10 is: 123,184.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,715.80 : 130,073.70 = 82,123.10 : x
  2. Step 2: Convert to fraction form
    86,715.80/130,073.70 = 82,123.10/x
  3. Step 3: Cross multiply
    86,715.80x = 130,073.70 × 82,123.10
  4. Step 4: Simplify right side
    86,715.80x = 10,682,055,472.47
  5. Step 5: Solve for x
    x = 10,682,055,472.47/86,715.80
  6. Step 6: Final answer
    x = 123,184.65

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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.