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Finding the Fourth Proportional to 432.64, 644.48 and 423.04

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Solution

The fourth proportional to 432.64, 644.48 and 423.04 is: 630.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.64 : 644.48 = 423.04 : x
  2. Step 2: Convert to fraction form
    432.64/644.48 = 423.04/x
  3. Step 3: Cross multiply
    432.64x = 644.48 × 423.04
  4. Step 4: Simplify right side
    432.64x = 272,640.82
  5. Step 5: Solve for x
    x = 272,640.82/432.64
  6. Step 6: Final answer
    x = 630.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.