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Finding the Fourth Proportional to 85,940.80, 129,008.40 and 66,306.40

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Solution

The fourth proportional to 85,940.80, 129,008.40 and 66,306.40 is: 99,534.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,940.80 : 129,008.40 = 66,306.40 : x
  2. Step 2: Convert to fraction form
    85,940.80/129,008.40 = 66,306.40/x
  3. Step 3: Cross multiply
    85,940.80x = 129,008.40 × 66,306.40
  4. Step 4: Simplify right side
    85,940.80x = 8,554,082,573.76
  5. Step 5: Solve for x
    x = 8,554,082,573.76/85,940.80
  6. Step 6: Final answer
    x = 99,534.59

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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.