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Finding the Fourth Proportional to 15,754.80, 21,741.88 and 8,681.12

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Solution

The fourth proportional to 15,754.80, 21,741.88 and 8,681.12 is: 11,980.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,754.80 : 21,741.88 = 8,681.12 : x
  2. Step 2: Convert to fraction form
    15,754.80/21,741.88 = 8,681.12/x
  3. Step 3: Cross multiply
    15,754.80x = 21,741.88 × 8,681.12
  4. Step 4: Simplify right side
    15,754.80x = 188,743,869.31
  5. Step 5: Solve for x
    x = 188,743,869.31/15,754.80
  6. Step 6: Final answer
    x = 11,980.09

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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.