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Finding the Fourth Proportional to 639.12, 882.24 and 473.28

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Solution

The fourth proportional to 639.12, 882.24 and 473.28 is: 653.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.12 : 882.24 = 473.28 : x
  2. Step 2: Convert to fraction form
    639.12/882.24 = 473.28/x
  3. Step 3: Cross multiply
    639.12x = 882.24 × 473.28
  4. Step 4: Simplify right side
    639.12x = 417,546.55
  5. Step 5: Solve for x
    x = 417,546.55/639.12
  6. Step 6: Final answer
    x = 653.31

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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.