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Finding the Fourth Proportional to 1,243.11, 1,864.54 and 318.64

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Solution

The fourth proportional to 1,243.11, 1,864.54 and 318.64 is: 477.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.11 : 1,864.54 = 318.64 : x
  2. Step 2: Convert to fraction form
    1,243.11/1,864.54 = 318.64/x
  3. Step 3: Cross multiply
    1,243.11x = 1,864.54 × 318.64
  4. Step 4: Simplify right side
    1,243.11x = 594,112.76
  5. Step 5: Solve for x
    x = 594,112.76/1,243.11
  6. Step 6: Final answer
    x = 477.93

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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.