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Finding the Fourth Proportional to 839.87, 1,158.38 and 745.44

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Solution

The fourth proportional to 839.87, 1,158.38 and 745.44 is: 1,028.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.87 : 1,158.38 = 745.44 : x
  2. Step 2: Convert to fraction form
    839.87/1,158.38 = 745.44/x
  3. Step 3: Cross multiply
    839.87x = 1,158.38 × 745.44
  4. Step 4: Simplify right side
    839.87x = 863,499.06
  5. Step 5: Solve for x
    x = 863,499.06/839.87
  6. Step 6: Final answer
    x = 1,028.13

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1.5x scale

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.