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Finding the Fourth Proportional to 15,752.80, 21,739.12 and 8,679.12

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Solution

The fourth proportional to 15,752.80, 21,739.12 and 8,679.12 is: 11,977.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,752.80 : 21,739.12 = 8,679.12 : x
  2. Step 2: Convert to fraction form
    15,752.80/21,739.12 = 8,679.12/x
  3. Step 3: Cross multiply
    15,752.80x = 21,739.12 × 8,679.12
  4. Step 4: Simplify right side
    15,752.80x = 188,676,431.17
  5. Step 5: Solve for x
    x = 188,676,431.17/15,752.80
  6. Step 6: Final answer
    x = 11,977.33

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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.