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Finding the Fourth Proportional to 521,712.70, 782,569.05 and 255,514.30

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Solution

The fourth proportional to 521,712.70, 782,569.05 and 255,514.30 is: 383,271.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,712.70 : 782,569.05 = 255,514.30 : x
  2. Step 2: Convert to fraction form
    521,712.70/782,569.05 = 255,514.30/x
  3. Step 3: Cross multiply
    521,712.70x = 782,569.05 × 255,514.30
  4. Step 4: Simplify right side
    521,712.70x = 199,957,583,012.42
  5. Step 5: Solve for x
    x = 199,957,583,012.42/521,712.70
  6. Step 6: Final answer
    x = 383,271.45

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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.