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Finding the Fourth Proportional to 449.39, 619.74 and 386.35

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Solution

The fourth proportional to 449.39, 619.74 and 386.35 is: 532.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.39 : 619.74 = 386.35 : x
  2. Step 2: Convert to fraction form
    449.39/619.74 = 386.35/x
  3. Step 3: Cross multiply
    449.39x = 619.74 × 386.35
  4. Step 4: Simplify right side
    449.39x = 239,436.55
  5. Step 5: Solve for x
    x = 239,436.55/449.39
  6. Step 6: Final answer
    x = 532.80

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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.