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Finding the Fourth Proportional to 515.76, 711.72 and 291.72

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Solution

The fourth proportional to 515.76, 711.72 and 291.72 is: 402.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.76 : 711.72 = 291.72 : x
  2. Step 2: Convert to fraction form
    515.76/711.72 = 291.72/x
  3. Step 3: Cross multiply
    515.76x = 711.72 × 291.72
  4. Step 4: Simplify right side
    515.76x = 207,622.96
  5. Step 5: Solve for x
    x = 207,622.96/515.76
  6. Step 6: Final answer
    x = 402.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.