Home / 15,489.11-21,371.31-9,115.99

Finding the Fourth Proportional to 15,489.11, 21,371.31 and 9,115.99

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Solution

The fourth proportional to 15,489.11, 21,371.31 and 9,115.99 is: 12,577.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,489.11 : 21,371.31 = 9,115.99 : x
  2. Step 2: Convert to fraction form
    15,489.11/21,371.31 = 9,115.99/x
  3. Step 3: Cross multiply
    15,489.11x = 21,371.31 × 9,115.99
  4. Step 4: Simplify right side
    15,489.11x = 194,820,594.82
  5. Step 5: Solve for x
    x = 194,820,594.82/15,489.11
  6. Step 6: Final answer
    x = 12,577.91

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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.