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Finding the Fourth Proportional to 756.78, 1,139.34 and 593.12

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Solution

The fourth proportional to 756.78, 1,139.34 and 593.12 is: 892.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.78 : 1,139.34 = 593.12 : x
  2. Step 2: Convert to fraction form
    756.78/1,139.34 = 593.12/x
  3. Step 3: Cross multiply
    756.78x = 1,139.34 × 593.12
  4. Step 4: Simplify right side
    756.78x = 675,765.34
  5. Step 5: Solve for x
    x = 675,765.34/756.78
  6. Step 6: Final answer
    x = 892.95

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.