Home / 1,538.87-2,121.95-1,040.65

Finding the Fourth Proportional to 1,538.87, 2,121.95 and 1,040.65

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Solution

The fourth proportional to 1,538.87, 2,121.95 and 1,040.65 is: 1,434.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,538.87 : 2,121.95 = 1,040.65 : x
  2. Step 2: Convert to fraction form
    1,538.87/2,121.95 = 1,040.65/x
  3. Step 3: Cross multiply
    1,538.87x = 2,121.95 × 1,040.65
  4. Step 4: Simplify right side
    1,538.87x = 2,208,198.71
  5. Step 5: Solve for x
    x = 2,208,198.71/1,538.87
  6. Step 6: Final answer
    x = 1,434.95

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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.