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Finding the Fourth Proportional to 449.68, 670.52 and 387.76

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Solution

The fourth proportional to 449.68, 670.52 and 387.76 is: 578.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.68 : 670.52 = 387.76 : x
  2. Step 2: Convert to fraction form
    449.68/670.52 = 387.76/x
  3. Step 3: Cross multiply
    449.68x = 670.52 × 387.76
  4. Step 4: Simplify right side
    449.68x = 260,000.84
  5. Step 5: Solve for x
    x = 260,000.84/449.68
  6. Step 6: Final answer
    x = 578.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.