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Finding the Fourth Proportional to 1,242.30, 1,864.44 and 694.38

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Solution

The fourth proportional to 1,242.30, 1,864.44 and 694.38 is: 1,042.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.30 : 1,864.44 = 694.38 : x
  2. Step 2: Convert to fraction form
    1,242.30/1,864.44 = 694.38/x
  3. Step 3: Cross multiply
    1,242.30x = 1,864.44 × 694.38
  4. Step 4: Simplify right side
    1,242.30x = 1,294,629.85
  5. Step 5: Solve for x
    x = 1,294,629.85/1,242.30
  6. Step 6: Final answer
    x = 1,042.12

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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.