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Finding the Fourth Proportional to 449.76, 620.08 and 387.52

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Solution

The fourth proportional to 449.76, 620.08 and 387.52 is: 534.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.76 : 620.08 = 387.52 : x
  2. Step 2: Convert to fraction form
    449.76/620.08 = 387.52/x
  3. Step 3: Cross multiply
    449.76x = 620.08 × 387.52
  4. Step 4: Simplify right side
    449.76x = 240,293.40
  5. Step 5: Solve for x
    x = 240,293.40/449.76
  6. Step 6: Final answer
    x = 534.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.