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Finding the Fourth Proportional to 1,135.53, 1,700.78 and 723.65

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Solution

The fourth proportional to 1,135.53, 1,700.78 and 723.65 is: 1,083.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.53 : 1,700.78 = 723.65 : x
  2. Step 2: Convert to fraction form
    1,135.53/1,700.78 = 723.65/x
  3. Step 3: Cross multiply
    1,135.53x = 1,700.78 × 723.65
  4. Step 4: Simplify right side
    1,135.53x = 1,230,757.32
  5. Step 5: Solve for x
    x = 1,230,757.32/1,135.53
  6. Step 6: Final answer
    x = 1,083.86

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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.