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Finding the Fourth Proportional to 432.72, 648.81 and 158.76

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Solution

The fourth proportional to 432.72, 648.81 and 158.76 is: 238.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.72 : 648.81 = 158.76 : x
  2. Step 2: Convert to fraction form
    432.72/648.81 = 158.76/x
  3. Step 3: Cross multiply
    432.72x = 648.81 × 158.76
  4. Step 4: Simplify right side
    432.72x = 103,005.08
  5. Step 5: Solve for x
    x = 103,005.08/432.72
  6. Step 6: Final answer
    x = 238.04

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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.