Home / 1,292.74-1,939.11-318.84

Finding the Fourth Proportional to 1,292.74, 1,939.11 and 318.84

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Solution

The fourth proportional to 1,292.74, 1,939.11 and 318.84 is: 478.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.74 : 1,939.11 = 318.84 : x
  2. Step 2: Convert to fraction form
    1,292.74/1,939.11 = 318.84/x
  3. Step 3: Cross multiply
    1,292.74x = 1,939.11 × 318.84
  4. Step 4: Simplify right side
    1,292.74x = 618,270.96
  5. Step 5: Solve for x
    x = 618,270.96/1,292.74
  6. Step 6: Final answer
    x = 478.26

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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.