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Finding the Fourth Proportional to 432.24, 645.07 and 421.30

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Solution

The fourth proportional to 432.24, 645.07 and 421.30 is: 628.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.24 : 645.07 = 421.30 : x
  2. Step 2: Convert to fraction form
    432.24/645.07 = 421.30/x
  3. Step 3: Cross multiply
    432.24x = 645.07 × 421.30
  4. Step 4: Simplify right side
    432.24x = 271,767.99
  5. Step 5: Solve for x
    x = 271,767.99/432.24
  6. Step 6: Final answer
    x = 628.74

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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.