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Finding the Fourth Proportional to 638.49, 880.92 and 386.53

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Solution

The fourth proportional to 638.49, 880.92 and 386.53 is: 533.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.49 : 880.92 = 386.53 : x
  2. Step 2: Convert to fraction form
    638.49/880.92 = 386.53/x
  3. Step 3: Cross multiply
    638.49x = 880.92 × 386.53
  4. Step 4: Simplify right side
    638.49x = 340,502.01
  5. Step 5: Solve for x
    x = 340,502.01/638.49
  6. Step 6: Final answer
    x = 533.30

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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.