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Finding the Fourth Proportional to 1,242.62, 1,863.92 and 318.17

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Solution

The fourth proportional to 1,242.62, 1,863.92 and 318.17 is: 477.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.62 : 1,863.92 = 318.17 : x
  2. Step 2: Convert to fraction form
    1,242.62/1,863.92 = 318.17/x
  3. Step 3: Cross multiply
    1,242.62x = 1,863.92 × 318.17
  4. Step 4: Simplify right side
    1,242.62x = 593,039.51
  5. Step 5: Solve for x
    x = 593,039.51/1,242.62
  6. Step 6: Final answer
    x = 477.25

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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.