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Finding the Fourth Proportional to 772.33, 1,158.87 and 339.43

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Solution

The fourth proportional to 772.33, 1,158.87 and 339.43 is: 509.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.33 : 1,158.87 = 339.43 : x
  2. Step 2: Convert to fraction form
    772.33/1,158.87 = 339.43/x
  3. Step 3: Cross multiply
    772.33x = 1,158.87 × 339.43
  4. Step 4: Simplify right side
    772.33x = 393,355.24
  5. Step 5: Solve for x
    x = 393,355.24/772.33
  6. Step 6: Final answer
    x = 509.31

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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.