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Finding the Fourth Proportional to 749.31, 1,121.97 and 575.58

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Solution

The fourth proportional to 749.31, 1,121.97 and 575.58 is: 861.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.31 : 1,121.97 = 575.58 : x
  2. Step 2: Convert to fraction form
    749.31/1,121.97 = 575.58/x
  3. Step 3: Cross multiply
    749.31x = 1,121.97 × 575.58
  4. Step 4: Simplify right side
    749.31x = 645,783.49
  5. Step 5: Solve for x
    x = 645,783.49/749.31
  6. Step 6: Final answer
    x = 861.84

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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.