Home / 20,862.16-31,292.78-5,279.78

Finding the Fourth Proportional to 20,862.16, 31,292.78 and 5,279.78

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Solution

The fourth proportional to 20,862.16, 31,292.78 and 5,279.78 is: 7,919.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,862.16 : 31,292.78 = 5,279.78 : x
  2. Step 2: Convert to fraction form
    20,862.16/31,292.78 = 5,279.78/x
  3. Step 3: Cross multiply
    20,862.16x = 31,292.78 × 5,279.78
  4. Step 4: Simplify right side
    20,862.16x = 165,219,075.52
  5. Step 5: Solve for x
    x = 165,219,075.52/20,862.16
  6. Step 6: Final answer
    x = 7,919.56

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1.5x scale

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.