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Finding the Fourth Proportional to 772.92, 1,158.42 and 388.28

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Solution

The fourth proportional to 772.92, 1,158.42 and 388.28 is: 581.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.92 : 1,158.42 = 388.28 : x
  2. Step 2: Convert to fraction form
    772.92/1,158.42 = 388.28/x
  3. Step 3: Cross multiply
    772.92x = 1,158.42 × 388.28
  4. Step 4: Simplify right side
    772.92x = 449,791.32
  5. Step 5: Solve for x
    x = 449,791.32/772.92
  6. Step 6: Final answer
    x = 581.94

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1.5x scale

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.