Home / 15,854.20-21,878.75-9,139.78

Finding the Fourth Proportional to 15,854.20, 21,878.75 and 9,139.78

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Solution

The fourth proportional to 15,854.20, 21,878.75 and 9,139.78 is: 12,612.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,854.20 : 21,878.75 = 9,139.78 : x
  2. Step 2: Convert to fraction form
    15,854.20/21,878.75 = 9,139.78/x
  3. Step 3: Cross multiply
    15,854.20x = 21,878.75 × 9,139.78
  4. Step 4: Simplify right side
    15,854.20x = 199,966,961.68
  5. Step 5: Solve for x
    x = 199,966,961.68/15,854.20
  6. Step 6: Final answer
    x = 12,612.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.