Home / 13,680.32-18,886.97-8,972.80

Finding the Fourth Proportional to 13,680.32, 18,886.97 and 8,972.80

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Solution

The fourth proportional to 13,680.32, 18,886.97 and 8,972.80 is: 12,387.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,680.32 : 18,886.97 = 8,972.80 : x
  2. Step 2: Convert to fraction form
    13,680.32/18,886.97 = 8,972.80/x
  3. Step 3: Cross multiply
    13,680.32x = 18,886.97 × 8,972.80
  4. Step 4: Simplify right side
    13,680.32x = 169,468,979.63
  5. Step 5: Solve for x
    x = 169,468,979.63/13,680.32
  6. Step 6: Final answer
    x = 12,387.80

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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.