Home / 1,243.14-1,865.13-780.38

Finding the Fourth Proportional to 1,243.14, 1,865.13 and 780.38

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Solution

The fourth proportional to 1,243.14, 1,865.13 and 780.38 is: 1,170.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.14 : 1,865.13 = 780.38 : x
  2. Step 2: Convert to fraction form
    1,243.14/1,865.13 = 780.38/x
  3. Step 3: Cross multiply
    1,243.14x = 1,865.13 × 780.38
  4. Step 4: Simplify right side
    1,243.14x = 1,455,510.15
  5. Step 5: Solve for x
    x = 1,455,510.15/1,243.14
  6. Step 6: Final answer
    x = 1,170.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.