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Finding the Fourth Proportional to 515.28, 772.40 and 271.92

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Solution

The fourth proportional to 515.28, 772.40 and 271.92 is: 407.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.28 : 772.40 = 271.92 : x
  2. Step 2: Convert to fraction form
    515.28/772.40 = 271.92/x
  3. Step 3: Cross multiply
    515.28x = 772.40 × 271.92
  4. Step 4: Simplify right side
    515.28x = 210,031.01
  5. Step 5: Solve for x
    x = 210,031.01/515.28
  6. Step 6: Final answer
    x = 407.61

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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.