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Finding the Fourth Proportional to 772.94, 1,158.72 and 642.56

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Solution

The fourth proportional to 772.94, 1,158.72 and 642.56 is: 963.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.94 : 1,158.72 = 642.56 : x
  2. Step 2: Convert to fraction form
    772.94/1,158.72 = 642.56/x
  3. Step 3: Cross multiply
    772.94x = 1,158.72 × 642.56
  4. Step 4: Simplify right side
    772.94x = 744,541.33
  5. Step 5: Solve for x
    x = 744,541.33/772.94
  6. Step 6: Final answer
    x = 963.27

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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.