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Finding the Fourth Proportional to 292.65, 438.89 and 87.17

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Solution

The fourth proportional to 292.65, 438.89 and 87.17 is: 130.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    292.65 : 438.89 = 87.17 : x
  2. Step 2: Convert to fraction form
    292.65/438.89 = 87.17/x
  3. Step 3: Cross multiply
    292.65x = 438.89 × 87.17
  4. Step 4: Simplify right side
    292.65x = 38,255.41
  5. Step 5: Solve for x
    x = 38,255.41/292.65
  6. Step 6: Final answer
    x = 130.72

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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.