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Finding the Fourth Proportional to 1,225.80, 1,691.45 and 694.60

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Solution

The fourth proportional to 1,225.80, 1,691.45 and 694.60 is: 958.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.80 : 1,691.45 = 694.60 : x
  2. Step 2: Convert to fraction form
    1,225.80/1,691.45 = 694.60/x
  3. Step 3: Cross multiply
    1,225.80x = 1,691.45 × 694.60
  4. Step 4: Simplify right side
    1,225.80x = 1,174,882.30
  5. Step 5: Solve for x
    x = 1,174,882.30/1,225.80
  6. Step 6: Final answer
    x = 958.46

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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.