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Finding the Fourth Proportional to 861,472.80, 1,292,209.20 and 221,775.30

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Solution

The fourth proportional to 861,472.80, 1,292,209.20 and 221,775.30 is: 332,662.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,472.80 : 1,292,209.20 = 221,775.30 : x
  2. Step 2: Convert to fraction form
    861,472.80/1,292,209.20 = 221,775.30/x
  3. Step 3: Cross multiply
    861,472.80x = 1,292,209.20 × 221,775.30
  4. Step 4: Simplify right side
    861,472.80x = 286,580,082,992.76
  5. Step 5: Solve for x
    x = 286,580,082,992.76/861,472.80
  6. Step 6: Final answer
    x = 332,662.95

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Double scale
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Similar ratio
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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.