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Finding the Fourth Proportional to 261,481.80, 392,481.90 and 128,512.20

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Solution

The fourth proportional to 261,481.80, 392,481.90 and 128,512.20 is: 192,895.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,481.80 : 392,481.90 = 128,512.20 : x
  2. Step 2: Convert to fraction form
    261,481.80/392,481.90 = 128,512.20/x
  3. Step 3: Cross multiply
    261,481.80x = 392,481.90 × 128,512.20
  4. Step 4: Simplify right side
    261,481.80x = 50,438,712,429.18
  5. Step 5: Solve for x
    x = 50,438,712,429.18/261,481.80
  6. Step 6: Final answer
    x = 192,895.69

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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.