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Finding the Fourth Proportional to 636.52, 879.30 and 557.68

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Solution

The fourth proportional to 636.52, 879.30 and 557.68 is: 770.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.52 : 879.30 = 557.68 : x
  2. Step 2: Convert to fraction form
    636.52/879.30 = 557.68/x
  3. Step 3: Cross multiply
    636.52x = 879.30 × 557.68
  4. Step 4: Simplify right side
    636.52x = 490,368.02
  5. Step 5: Solve for x
    x = 490,368.02/636.52
  6. Step 6: Final answer
    x = 770.39

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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.