Home / 1,292.40-1,937.88-1,138.68

Finding the Fourth Proportional to 1,292.40, 1,937.88 and 1,138.68

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Solution

The fourth proportional to 1,292.40, 1,937.88 and 1,138.68 is: 1,707.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.40 : 1,937.88 = 1,138.68 : x
  2. Step 2: Convert to fraction form
    1,292.40/1,937.88 = 1,138.68/x
  3. Step 3: Cross multiply
    1,292.40x = 1,937.88 × 1,138.68
  4. Step 4: Simplify right side
    1,292.40x = 2,206,625.20
  5. Step 5: Solve for x
    x = 2,206,625.20/1,292.40
  6. Step 6: Final answer
    x = 1,707.39

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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.