Home / 1,422.80-2,123.92-1,315.92

Finding the Fourth Proportional to 1,422.80, 2,123.92 and 1,315.92

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Solution

The fourth proportional to 1,422.80, 2,123.92 and 1,315.92 is: 1,964.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,422.80 : 2,123.92 = 1,315.92 : x
  2. Step 2: Convert to fraction form
    1,422.80/2,123.92 = 1,315.92/x
  3. Step 3: Cross multiply
    1,422.80x = 2,123.92 × 1,315.92
  4. Step 4: Simplify right side
    1,422.80x = 2,794,908.81
  5. Step 5: Solve for x
    x = 2,794,908.81/1,422.80
  6. Step 6: Final answer
    x = 1,964.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.