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Finding the Fourth Proportional to 288.66, 432.98 and 115.42

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Solution

The fourth proportional to 288.66, 432.98 and 115.42 is: 173.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.66 : 432.98 = 115.42 : x
  2. Step 2: Convert to fraction form
    288.66/432.98 = 115.42/x
  3. Step 3: Cross multiply
    288.66x = 432.98 × 115.42
  4. Step 4: Simplify right side
    288.66x = 49,974.55
  5. Step 5: Solve for x
    x = 49,974.55/288.66
  6. Step 6: Final answer
    x = 173.13

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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.