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Finding the Fourth Proportional to 638.52, 881.51 and 439.64

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Solution

The fourth proportional to 638.52, 881.51 and 439.64 is: 606.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.52 : 881.51 = 439.64 : x
  2. Step 2: Convert to fraction form
    638.52/881.51 = 439.64/x
  3. Step 3: Cross multiply
    638.52x = 881.51 × 439.64
  4. Step 4: Simplify right side
    638.52x = 387,547.06
  5. Step 5: Solve for x
    x = 387,547.06/638.52
  6. Step 6: Final answer
    x = 606.95

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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.