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Finding the Fourth Proportional to 1,292.75, 1,939.10 and 318.86

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Solution

The fourth proportional to 1,292.75, 1,939.10 and 318.86 is: 478.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.75 : 1,939.10 = 318.86 : x
  2. Step 2: Convert to fraction form
    1,292.75/1,939.10 = 318.86/x
  3. Step 3: Cross multiply
    1,292.75x = 1,939.10 × 318.86
  4. Step 4: Simplify right side
    1,292.75x = 618,290.14
  5. Step 5: Solve for x
    x = 618,290.14/1,292.75
  6. Step 6: Final answer
    x = 478.28

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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.