Home / 10,890.14-15,022.85-7,115.51

Finding the Fourth Proportional to 10,890.14, 15,022.85 and 7,115.51

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Solution

The fourth proportional to 10,890.14, 15,022.85 and 7,115.51 is: 9,815.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,890.14 : 15,022.85 = 7,115.51 : x
  2. Step 2: Convert to fraction form
    10,890.14/15,022.85 = 7,115.51/x
  3. Step 3: Cross multiply
    10,890.14x = 15,022.85 × 7,115.51
  4. Step 4: Simplify right side
    10,890.14x = 106,895,226.56
  5. Step 5: Solve for x
    x = 106,895,226.56/10,890.14
  6. Step 6: Final answer
    x = 9,815.79

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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.