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Finding the Fourth Proportional to 86,491.80, 129,834.90 and 66,857.40

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Solution

The fourth proportional to 86,491.80, 129,834.90 and 66,857.40 is: 100,361.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,491.80 : 129,834.90 = 66,857.40 : x
  2. Step 2: Convert to fraction form
    86,491.80/129,834.90 = 66,857.40/x
  3. Step 3: Cross multiply
    86,491.80x = 129,834.90 × 66,857.40
  4. Step 4: Simplify right side
    86,491.80x = 8,680,423,843.26
  5. Step 5: Solve for x
    x = 8,680,423,843.26/86,491.80
  6. Step 6: Final answer
    x = 100,361.23

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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.