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Finding the Fourth Proportional to 449.92, 671.52 and 387.94

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Solution

The fourth proportional to 449.92, 671.52 and 387.94 is: 579.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.92 : 671.52 = 387.94 : x
  2. Step 2: Convert to fraction form
    449.92/671.52 = 387.94/x
  3. Step 3: Cross multiply
    449.92x = 671.52 × 387.94
  4. Step 4: Simplify right side
    449.92x = 260,509.47
  5. Step 5: Solve for x
    x = 260,509.47/449.92
  6. Step 6: Final answer
    x = 579.01

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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.