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Finding the Fourth Proportional to 449.91, 619.38 and 387.50

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Solution

The fourth proportional to 449.91, 619.38 and 387.50 is: 533.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.91 : 619.38 = 387.50 : x
  2. Step 2: Convert to fraction form
    449.91/619.38 = 387.50/x
  3. Step 3: Cross multiply
    449.91x = 619.38 × 387.50
  4. Step 4: Simplify right side
    449.91x = 240,006.65
  5. Step 5: Solve for x
    x = 240,006.65/449.91
  6. Step 6: Final answer
    x = 533.45

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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.