Home / 11,107.84-15,314.88-7,121.92

Finding the Fourth Proportional to 11,107.84, 15,314.88 and 7,121.92

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Solution

The fourth proportional to 11,107.84, 15,314.88 and 7,121.92 is: 9,819.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,107.84 : 15,314.88 = 7,121.92 : x
  2. Step 2: Convert to fraction form
    11,107.84/15,314.88 = 7,121.92/x
  3. Step 3: Cross multiply
    11,107.84x = 15,314.88 × 7,121.92
  4. Step 4: Simplify right side
    11,107.84x = 109,071,350.17
  5. Step 5: Solve for x
    x = 109,071,350.17/11,107.84
  6. Step 6: Final answer
    x = 9,819.31

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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.