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Finding the Fourth Proportional to 510.85, 766.20 and 145.60

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Solution

The fourth proportional to 510.85, 766.20 and 145.60 is: 218.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.85 : 766.20 = 145.60 : x
  2. Step 2: Convert to fraction form
    510.85/766.20 = 145.60/x
  3. Step 3: Cross multiply
    510.85x = 766.20 × 145.60
  4. Step 4: Simplify right side
    510.85x = 111,558.72
  5. Step 5: Solve for x
    x = 111,558.72/510.85
  6. Step 6: Final answer
    x = 218.38

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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.