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Finding the Fourth Proportional to 639.13, 882.36 and 483.61

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Solution

The fourth proportional to 639.13, 882.36 and 483.61 is: 667.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.13 : 882.36 = 483.61 : x
  2. Step 2: Convert to fraction form
    639.13/882.36 = 483.61/x
  3. Step 3: Cross multiply
    639.13x = 882.36 × 483.61
  4. Step 4: Simplify right side
    639.13x = 426,718.12
  5. Step 5: Solve for x
    x = 426,718.12/639.13
  6. Step 6: Final answer
    x = 667.65

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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.