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Finding the Fourth Proportional to 839.99, 1,158.55 and 745.57

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Solution

The fourth proportional to 839.99, 1,158.55 and 745.57 is: 1,028.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.99 : 1,158.55 = 745.57 : x
  2. Step 2: Convert to fraction form
    839.99/1,158.55 = 745.57/x
  3. Step 3: Cross multiply
    839.99x = 1,158.55 × 745.57
  4. Step 4: Simplify right side
    839.99x = 863,775.36
  5. Step 5: Solve for x
    x = 863,775.36/839.99
  6. Step 6: Final answer
    x = 1,028.31

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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.