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Finding the Fourth Proportional to 515.82, 711.87 and 397.92

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Solution

The fourth proportional to 515.82, 711.87 and 397.92 is: 549.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.82 : 711.87 = 397.92 : x
  2. Step 2: Convert to fraction form
    515.82/711.87 = 397.92/x
  3. Step 3: Cross multiply
    515.82x = 711.87 × 397.92
  4. Step 4: Simplify right side
    515.82x = 283,267.31
  5. Step 5: Solve for x
    x = 283,267.31/515.82
  6. Step 6: Final answer
    x = 549.16

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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.