Home / 15,278.80-21,084.36-8,991.56

Finding the Fourth Proportional to 15,278.80, 21,084.36 and 8,991.56

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Solution

The fourth proportional to 15,278.80, 21,084.36 and 8,991.56 is: 12,408.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,278.80 : 21,084.36 = 8,991.56 : x
  2. Step 2: Convert to fraction form
    15,278.80/21,084.36 = 8,991.56/x
  3. Step 3: Cross multiply
    15,278.80x = 21,084.36 × 8,991.56
  4. Step 4: Simplify right side
    15,278.80x = 189,581,288.00
  5. Step 5: Solve for x
    x = 189,581,288.00/15,278.80
  6. Step 6: Final answer
    x = 12,408.13

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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.