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Finding the Fourth Proportional to 453.40, 680.15 and 145.20

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Solution

The fourth proportional to 453.40, 680.15 and 145.20 is: 217.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.40 : 680.15 = 145.20 : x
  2. Step 2: Convert to fraction form
    453.40/680.15 = 145.20/x
  3. Step 3: Cross multiply
    453.40x = 680.15 × 145.20
  4. Step 4: Simplify right side
    453.40x = 98,757.78
  5. Step 5: Solve for x
    x = 98,757.78/453.40
  6. Step 6: Final answer
    x = 217.82

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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.