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Finding the Fourth Proportional to 837.80, 1,257.90 and 655.40

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Solution

The fourth proportional to 837.80, 1,257.90 and 655.40 is: 984.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.80 : 1,257.90 = 655.40 : x
  2. Step 2: Convert to fraction form
    837.80/1,257.90 = 655.40/x
  3. Step 3: Cross multiply
    837.80x = 1,257.90 × 655.40
  4. Step 4: Simplify right side
    837.80x = 824,427.66
  5. Step 5: Solve for x
    x = 824,427.66/837.80
  6. Step 6: Final answer
    x = 984.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.