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Finding the Fourth Proportional to 510.65, 765.13 and 491.70

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Solution

The fourth proportional to 510.65, 765.13 and 491.70 is: 736.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.65 : 765.13 = 491.70 : x
  2. Step 2: Convert to fraction form
    510.65/765.13 = 491.70/x
  3. Step 3: Cross multiply
    510.65x = 765.13 × 491.70
  4. Step 4: Simplify right side
    510.65x = 376,214.42
  5. Step 5: Solve for x
    x = 376,214.42/510.65
  6. Step 6: Final answer
    x = 736.74

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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.