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Finding the Fourth Proportional to 15,764.44, 21,754.08 and 8,689.48

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Solution

The fourth proportional to 15,764.44, 21,754.08 and 8,689.48 is: 11,991.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,764.44 : 21,754.08 = 8,689.48 : x
  2. Step 2: Convert to fraction form
    15,764.44/21,754.08 = 8,689.48/x
  3. Step 3: Cross multiply
    15,764.44x = 21,754.08 × 8,689.48
  4. Step 4: Simplify right side
    15,764.44x = 189,031,643.08
  5. Step 5: Solve for x
    x = 189,031,643.08/15,764.44
  6. Step 6: Final answer
    x = 11,991.02

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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.