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Finding the Fourth Proportional to 449.01, 673.45 and 140.78

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Solution

The fourth proportional to 449.01, 673.45 and 140.78 is: 211.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.01 : 673.45 = 140.78 : x
  2. Step 2: Convert to fraction form
    449.01/673.45 = 140.78/x
  3. Step 3: Cross multiply
    449.01x = 673.45 × 140.78
  4. Step 4: Simplify right side
    449.01x = 94,808.29
  5. Step 5: Solve for x
    x = 94,808.29/449.01
  6. Step 6: Final answer
    x = 211.15

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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.