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Finding the Fourth Proportional to 432.36, 648.22 and 143.72

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Solution

The fourth proportional to 432.36, 648.22 and 143.72 is: 215.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.36 : 648.22 = 143.72 : x
  2. Step 2: Convert to fraction form
    432.36/648.22 = 143.72/x
  3. Step 3: Cross multiply
    432.36x = 648.22 × 143.72
  4. Step 4: Simplify right side
    432.36x = 93,162.18
  5. Step 5: Solve for x
    x = 93,162.18/432.36
  6. Step 6: Final answer
    x = 215.47

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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.