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Finding the Fourth Proportional to 1,200.98, 1,657.42 and 677

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Solution

The fourth proportional to 1,200.98, 1,657.42 and 677 is: 934.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.98 : 1,657.42 = 677 : x
  2. Step 2: Convert to fraction form
    1,200.98/1,657.42 = 677/x
  3. Step 3: Cross multiply
    1,200.98x = 1,657.42 × 677
  4. Step 4: Simplify right side
    1,200.98x = 1,122,073.34
  5. Step 5: Solve for x
    x = 1,122,073.34/1,200.98
  6. Step 6: Final answer
    x = 934.30

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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.