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Finding the Fourth Proportional to 402.18, 602.90 and 145.62

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Solution

The fourth proportional to 402.18, 602.90 and 145.62 is: 218.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.18 : 602.90 = 145.62 : x
  2. Step 2: Convert to fraction form
    402.18/602.90 = 145.62/x
  3. Step 3: Cross multiply
    402.18x = 602.90 × 145.62
  4. Step 4: Simplify right side
    402.18x = 87,794.30
  5. Step 5: Solve for x
    x = 87,794.30/402.18
  6. Step 6: Final answer
    x = 218.30

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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.