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Finding the Fourth Proportional to 449.58, 619.82 and 387.12

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Solution

The fourth proportional to 449.58, 619.82 and 387.12 is: 533.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.58 : 619.82 = 387.12 : x
  2. Step 2: Convert to fraction form
    449.58/619.82 = 387.12/x
  3. Step 3: Cross multiply
    449.58x = 619.82 × 387.12
  4. Step 4: Simplify right side
    449.58x = 239,944.72
  5. Step 5: Solve for x
    x = 239,944.72/449.58
  6. Step 6: Final answer
    x = 533.71

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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.