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Finding the Fourth Proportional to 647.56, 887.80 and 635.90

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Solution

The fourth proportional to 647.56, 887.80 and 635.90 is: 871.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.56 : 887.80 = 635.90 : x
  2. Step 2: Convert to fraction form
    647.56/887.80 = 635.90/x
  3. Step 3: Cross multiply
    647.56x = 887.80 × 635.90
  4. Step 4: Simplify right side
    647.56x = 564,550.43
  5. Step 5: Solve for x
    x = 564,550.43/647.56
  6. Step 6: Final answer
    x = 871.82

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.