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Finding the Fourth Proportional to 510.76, 765.45 and 266.78

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Solution

The fourth proportional to 510.76, 765.45 and 266.78 is: 399.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.76 : 765.45 = 266.78 : x
  2. Step 2: Convert to fraction form
    510.76/765.45 = 266.78/x
  3. Step 3: Cross multiply
    510.76x = 765.45 × 266.78
  4. Step 4: Simplify right side
    510.76x = 204,208.66
  5. Step 5: Solve for x
    x = 204,208.66/510.76
  6. Step 6: Final answer
    x = 399.81

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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.