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Finding the Fourth Proportional to 128,473.40, 192,710.10 and 81,234.20

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Solution

The fourth proportional to 128,473.40, 192,710.10 and 81,234.20 is: 121,851.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,473.40 : 192,710.10 = 81,234.20 : x
  2. Step 2: Convert to fraction form
    128,473.40/192,710.10 = 81,234.20/x
  3. Step 3: Cross multiply
    128,473.40x = 192,710.10 × 81,234.20
  4. Step 4: Simplify right side
    128,473.40x = 15,654,650,805.42
  5. Step 5: Solve for x
    x = 15,654,650,805.42/128,473.40
  6. Step 6: Final answer
    x = 121,851.30

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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.