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Finding the Fourth Proportional to 432.81, 648.72 and 144.18

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Solution

The fourth proportional to 432.81, 648.72 and 144.18 is: 216.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.81 : 648.72 = 144.18 : x
  2. Step 2: Convert to fraction form
    432.81/648.72 = 144.18/x
  3. Step 3: Cross multiply
    432.81x = 648.72 × 144.18
  4. Step 4: Simplify right side
    432.81x = 93,532.45
  5. Step 5: Solve for x
    x = 93,532.45/432.81
  6. Step 6: Final answer
    x = 216.11

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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.