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Finding the Fourth Proportional to 449.92, 619.32 and 391.60

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Solution

The fourth proportional to 449.92, 619.32 and 391.60 is: 539.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.92 : 619.32 = 391.60 : x
  2. Step 2: Convert to fraction form
    449.92/619.32 = 391.60/x
  3. Step 3: Cross multiply
    449.92x = 619.32 × 391.60
  4. Step 4: Simplify right side
    449.92x = 242,525.71
  5. Step 5: Solve for x
    x = 242,525.71/449.92
  6. Step 6: Final answer
    x = 539.04

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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.