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Finding the Fourth Proportional to 449.46, 674.60 and 312.57

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Solution

The fourth proportional to 449.46, 674.60 and 312.57 is: 469.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.46 : 674.60 = 312.57 : x
  2. Step 2: Convert to fraction form
    449.46/674.60 = 312.57/x
  3. Step 3: Cross multiply
    449.46x = 674.60 × 312.57
  4. Step 4: Simplify right side
    449.46x = 210,858.16
  5. Step 5: Solve for x
    x = 210,858.16/449.46
  6. Step 6: Final answer
    x = 469.14

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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.