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Finding the Fourth Proportional to 87.49, 120.68 and 52.49

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Solution

The fourth proportional to 87.49, 120.68 and 52.49 is: 72.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.49 : 120.68 = 52.49 : x
  2. Step 2: Convert to fraction form
    87.49/120.68 = 52.49/x
  3. Step 3: Cross multiply
    87.49x = 120.68 × 52.49
  4. Step 4: Simplify right side
    87.49x = 6,334.49
  5. Step 5: Solve for x
    x = 6,334.49/87.49
  6. Step 6: Final answer
    x = 72.40

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