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Finding the Fourth Proportional to 815.01, 1,222.85 and 449.76

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Solution

The fourth proportional to 815.01, 1,222.85 and 449.76 is: 674.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.01 : 1,222.85 = 449.76 : x
  2. Step 2: Convert to fraction form
    815.01/1,222.85 = 449.76/x
  3. Step 3: Cross multiply
    815.01x = 1,222.85 × 449.76
  4. Step 4: Simplify right side
    815.01x = 549,989.02
  5. Step 5: Solve for x
    x = 549,989.02/815.01
  6. Step 6: Final answer
    x = 674.82

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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.