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Finding the Fourth Proportional to 510.80, 764.96 and 388.08

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Solution

The fourth proportional to 510.80, 764.96 and 388.08 is: 581.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.80 : 764.96 = 388.08 : x
  2. Step 2: Convert to fraction form
    510.80/764.96 = 388.08/x
  3. Step 3: Cross multiply
    510.80x = 764.96 × 388.08
  4. Step 4: Simplify right side
    510.80x = 296,865.68
  5. Step 5: Solve for x
    x = 296,865.68/510.80
  6. Step 6: Final answer
    x = 581.18

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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.