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Finding the Fourth Proportional to 15,876.80, 21,909.60 and 8,803.28

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Solution

The fourth proportional to 15,876.80, 21,909.60 and 8,803.28 is: 12,148.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,876.80 : 21,909.60 = 8,803.28 : x
  2. Step 2: Convert to fraction form
    15,876.80/21,909.60 = 8,803.28/x
  3. Step 3: Cross multiply
    15,876.80x = 21,909.60 × 8,803.28
  4. Step 4: Simplify right side
    15,876.80x = 192,876,343.49
  5. Step 5: Solve for x
    x = 192,876,343.49/15,876.80
  6. Step 6: Final answer
    x = 12,148.31

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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.