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Finding the Fourth Proportional to 510.78, 766.20 and 168.78

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Solution

The fourth proportional to 510.78, 766.20 and 168.78 is: 253.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.78 : 766.20 = 168.78 : x
  2. Step 2: Convert to fraction form
    510.78/766.20 = 168.78/x
  3. Step 3: Cross multiply
    510.78x = 766.20 × 168.78
  4. Step 4: Simplify right side
    510.78x = 129,319.24
  5. Step 5: Solve for x
    x = 129,319.24/510.78
  6. Step 6: Final answer
    x = 253.18

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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.