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Finding the Fourth Proportional to 449.56, 619.86 and 387.29

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Solution

The fourth proportional to 449.56, 619.86 and 387.29 is: 534.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.56 : 619.86 = 387.29 : x
  2. Step 2: Convert to fraction form
    449.56/619.86 = 387.29/x
  3. Step 3: Cross multiply
    449.56x = 619.86 × 387.29
  4. Step 4: Simplify right side
    449.56x = 240,062.48
  5. Step 5: Solve for x
    x = 240,062.48/449.56
  6. Step 6: Final answer
    x = 534.00

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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.