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Finding the Fourth Proportional to 381,330.90, 571,996.35 and 319,122.90

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Solution

The fourth proportional to 381,330.90, 571,996.35 and 319,122.90 is: 478,684.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,330.90 : 571,996.35 = 319,122.90 : x
  2. Step 2: Convert to fraction form
    381,330.90/571,996.35 = 319,122.90/x
  3. Step 3: Cross multiply
    381,330.90x = 571,996.35 × 319,122.90
  4. Step 4: Simplify right side
    381,330.90x = 182,537,134,001.42
  5. Step 5: Solve for x
    x = 182,537,134,001.42/381,330.90
  6. Step 6: Final answer
    x = 478,684.35

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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.