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Finding the Fourth Proportional to 15,854.80, 21,878.80 and 8,780.80

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Solution

The fourth proportional to 15,854.80, 21,878.80 and 8,780.80 is: 12,117.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,854.80 : 21,878.80 = 8,780.80 : x
  2. Step 2: Convert to fraction form
    15,854.80/21,878.80 = 8,780.80/x
  3. Step 3: Cross multiply
    15,854.80x = 21,878.80 × 8,780.80
  4. Step 4: Simplify right side
    15,854.80x = 192,113,367.04
  5. Step 5: Solve for x
    x = 192,113,367.04/15,854.80
  6. Step 6: Final answer
    x = 12,117.05

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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.