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Finding the Fourth Proportional to 432.12, 648.72 and 400.80

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Solution

The fourth proportional to 432.12, 648.72 and 400.80 is: 601.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.12 : 648.72 = 400.80 : x
  2. Step 2: Convert to fraction form
    432.12/648.72 = 400.80/x
  3. Step 3: Cross multiply
    432.12x = 648.72 × 400.80
  4. Step 4: Simplify right side
    432.12x = 260,006.98
  5. Step 5: Solve for x
    x = 260,006.98/432.12
  6. Step 6: Final answer
    x = 601.70

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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.