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Finding the Fourth Proportional to 432.12, 644.91 and 420.60

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Solution

The fourth proportional to 432.12, 644.91 and 420.60 is: 627.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.12 : 644.91 = 420.60 : x
  2. Step 2: Convert to fraction form
    432.12/644.91 = 420.60/x
  3. Step 3: Cross multiply
    432.12x = 644.91 × 420.60
  4. Step 4: Simplify right side
    432.12x = 271,249.15
  5. Step 5: Solve for x
    x = 271,249.15/432.12
  6. Step 6: Final answer
    x = 627.72

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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.