Home / 15,854.28-21,878.89-8,780.73

Finding the Fourth Proportional to 15,854.28, 21,878.89 and 8,780.73

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Solution

The fourth proportional to 15,854.28, 21,878.89 and 8,780.73 is: 12,117.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,854.28 : 21,878.89 = 8,780.73 : x
  2. Step 2: Convert to fraction form
    15,854.28/21,878.89 = 8,780.73/x
  3. Step 3: Cross multiply
    15,854.28x = 21,878.89 × 8,780.73
  4. Step 4: Simplify right side
    15,854.28x = 192,112,625.79
  5. Step 5: Solve for x
    x = 192,112,625.79/15,854.28
  6. Step 6: Final answer
    x = 12,117.40

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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.