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Finding the Fourth Proportional to 15,694.16, 21,657.88 and 8,979.76

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Solution

The fourth proportional to 15,694.16, 21,657.88 and 8,979.76 is: 12,392.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,694.16 : 21,657.88 = 8,979.76 : x
  2. Step 2: Convert to fraction form
    15,694.16/21,657.88 = 8,979.76/x
  3. Step 3: Cross multiply
    15,694.16x = 21,657.88 × 8,979.76
  4. Step 4: Simplify right side
    15,694.16x = 194,482,602.81
  5. Step 5: Solve for x
    x = 194,482,602.81/15,694.16
  6. Step 6: Final answer
    x = 12,392.04

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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.