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Finding the Fourth Proportional to 510.78, 766.40 and 186.20

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Solution

The fourth proportional to 510.78, 766.40 and 186.20 is: 279.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.78 : 766.40 = 186.20 : x
  2. Step 2: Convert to fraction form
    510.78/766.40 = 186.20/x
  3. Step 3: Cross multiply
    510.78x = 766.40 × 186.20
  4. Step 4: Simplify right side
    510.78x = 142,698.92
  5. Step 5: Solve for x
    x = 142,698.92/510.78
  6. Step 6: Final answer
    x = 279.37

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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.