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Finding the Fourth Proportional to 71,325.80, 106,988.70 and 66,660.20

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Solution

The fourth proportional to 71,325.80, 106,988.70 and 66,660.20 is: 99,990.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,325.80 : 106,988.70 = 66,660.20 : x
  2. Step 2: Convert to fraction form
    71,325.80/106,988.70 = 66,660.20/x
  3. Step 3: Cross multiply
    71,325.80x = 106,988.70 × 66,660.20
  4. Step 4: Simplify right side
    71,325.80x = 7,131,888,139.74
  5. Step 5: Solve for x
    x = 7,131,888,139.74/71,325.80
  6. Step 6: Final answer
    x = 99,990.30

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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.