Home / 1,538.13-2,121.30-977.97

Finding the Fourth Proportional to 1,538.13, 2,121.30 and 977.97

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Solution

The fourth proportional to 1,538.13, 2,121.30 and 977.97 is: 1,348.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,538.13 : 2,121.30 = 977.97 : x
  2. Step 2: Convert to fraction form
    1,538.13/2,121.30 = 977.97/x
  3. Step 3: Cross multiply
    1,538.13x = 2,121.30 × 977.97
  4. Step 4: Simplify right side
    1,538.13x = 2,074,567.76
  5. Step 5: Solve for x
    x = 2,074,567.76/1,538.13
  6. Step 6: Final answer
    x = 1,348.76

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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.