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Finding the Fourth Proportional to 192,700.80, 288,662.40 and 129,715.20

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Solution

The fourth proportional to 192,700.80, 288,662.40 and 129,715.20 is: 194,311.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    192,700.80 : 288,662.40 = 129,715.20 : x
  2. Step 2: Convert to fraction form
    192,700.80/288,662.40 = 129,715.20/x
  3. Step 3: Cross multiply
    192,700.80x = 288,662.40 × 129,715.20
  4. Step 4: Simplify right side
    192,700.80x = 37,443,900,948.48
  5. Step 5: Solve for x
    x = 37,443,900,948.48/192,700.80
  6. Step 6: Final answer
    x = 194,311.08

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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.