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Finding the Fourth Proportional to 279.54, 419.29 and 87.16

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Solution

The fourth proportional to 279.54, 419.29 and 87.16 is: 130.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.54 : 419.29 = 87.16 : x
  2. Step 2: Convert to fraction form
    279.54/419.29 = 87.16/x
  3. Step 3: Cross multiply
    279.54x = 419.29 × 87.16
  4. Step 4: Simplify right side
    279.54x = 36,545.32
  5. Step 5: Solve for x
    x = 36,545.32/279.54
  6. Step 6: Final answer
    x = 130.73

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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.