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Finding the Fourth Proportional to 639.36, 883.68 and 563.52

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Solution

The fourth proportional to 639.36, 883.68 and 563.52 is: 778.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.36 : 883.68 = 563.52 : x
  2. Step 2: Convert to fraction form
    639.36/883.68 = 563.52/x
  3. Step 3: Cross multiply
    639.36x = 883.68 × 563.52
  4. Step 4: Simplify right side
    639.36x = 497,971.35
  5. Step 5: Solve for x
    x = 497,971.35/639.36
  6. Step 6: Final answer
    x = 778.86

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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.