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Finding the Fourth Proportional to 449.91, 619.32 and 387.95

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Solution

The fourth proportional to 449.91, 619.32 and 387.95 is: 534.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.91 : 619.32 = 387.95 : x
  2. Step 2: Convert to fraction form
    449.91/619.32 = 387.95/x
  3. Step 3: Cross multiply
    449.91x = 619.32 × 387.95
  4. Step 4: Simplify right side
    449.91x = 240,263.65
  5. Step 5: Solve for x
    x = 240,263.65/449.91
  6. Step 6: Final answer
    x = 534.02

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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.