Home / 1,139.24-1,572.18-789.80

Finding the Fourth Proportional to 1,139.24, 1,572.18 and 789.80

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Solution

The fourth proportional to 1,139.24, 1,572.18 and 789.80 is: 1,089.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.24 : 1,572.18 = 789.80 : x
  2. Step 2: Convert to fraction form
    1,139.24/1,572.18 = 789.80/x
  3. Step 3: Cross multiply
    1,139.24x = 1,572.18 × 789.80
  4. Step 4: Simplify right side
    1,139.24x = 1,241,707.76
  5. Step 5: Solve for x
    x = 1,241,707.76/1,139.24
  6. Step 6: Final answer
    x = 1,089.94

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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.