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Finding the Fourth Proportional to 402.40, 602.20 and 240.20

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Solution

The fourth proportional to 402.40, 602.20 and 240.20 is: 359.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.40 : 602.20 = 240.20 : x
  2. Step 2: Convert to fraction form
    402.40/602.20 = 240.20/x
  3. Step 3: Cross multiply
    402.40x = 602.20 × 240.20
  4. Step 4: Simplify right side
    402.40x = 144,648.44
  5. Step 5: Solve for x
    x = 144,648.44/402.40
  6. Step 6: Final answer
    x = 359.46

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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.