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Finding the Fourth Proportional to 402.44, 602.90 and 210.20

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Solution

The fourth proportional to 402.44, 602.90 and 210.20 is: 314.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.44 : 602.90 = 210.20 : x
  2. Step 2: Convert to fraction form
    402.44/602.90 = 210.20/x
  3. Step 3: Cross multiply
    402.44x = 602.90 × 210.20
  4. Step 4: Simplify right side
    402.44x = 126,729.58
  5. Step 5: Solve for x
    x = 126,729.58/402.44
  6. Step 6: Final answer
    x = 314.90

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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.