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Finding the Fourth Proportional to 15,694.56, 21,657.78 and 8,980.74

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Solution

The fourth proportional to 15,694.56, 21,657.78 and 8,980.74 is: 12,393.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,694.56 : 21,657.78 = 8,980.74 : x
  2. Step 2: Convert to fraction form
    15,694.56/21,657.78 = 8,980.74/x
  3. Step 3: Cross multiply
    15,694.56x = 21,657.78 × 8,980.74
  4. Step 4: Simplify right side
    15,694.56x = 194,502,891.16
  5. Step 5: Solve for x
    x = 194,502,891.16/15,694.56
  6. Step 6: Final answer
    x = 12,393.01

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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.