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Finding the Fourth Proportional to 871.50, 1,307.10 and 255.18

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Solution

The fourth proportional to 871.50, 1,307.10 and 255.18 is: 382.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.50 : 1,307.10 = 255.18 : x
  2. Step 2: Convert to fraction form
    871.50/1,307.10 = 255.18/x
  3. Step 3: Cross multiply
    871.50x = 1,307.10 × 255.18
  4. Step 4: Simplify right side
    871.50x = 333,545.78
  5. Step 5: Solve for x
    x = 333,545.78/871.50
  6. Step 6: Final answer
    x = 382.73

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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.