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Finding the Fourth Proportional to 1,143.02, 1,577.16 and 789.65

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Solution

The fourth proportional to 1,143.02, 1,577.16 and 789.65 is: 1,089.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.02 : 1,577.16 = 789.65 : x
  2. Step 2: Convert to fraction form
    1,143.02/1,577.16 = 789.65/x
  3. Step 3: Cross multiply
    1,143.02x = 1,577.16 × 789.65
  4. Step 4: Simplify right side
    1,143.02x = 1,245,396.51
  5. Step 5: Solve for x
    x = 1,245,396.51/1,143.02
  6. Step 6: Final answer
    x = 1,089.57

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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.