Home / 1,292.10-1,938.15-1,279.95

Finding the Fourth Proportional to 1,292.10, 1,938.15 and 1,279.95

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Solution

The fourth proportional to 1,292.10, 1,938.15 and 1,279.95 is: 1,919.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.10 : 1,938.15 = 1,279.95 : x
  2. Step 2: Convert to fraction form
    1,292.10/1,938.15 = 1,279.95/x
  3. Step 3: Cross multiply
    1,292.10x = 1,938.15 × 1,279.95
  4. Step 4: Simplify right side
    1,292.10x = 2,480,735.09
  5. Step 5: Solve for x
    x = 2,480,735.09/1,292.10
  6. Step 6: Final answer
    x = 1,919.93

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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.