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Finding the Fourth Proportional to 749.62, 1,124.69 and 311.11

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Solution

The fourth proportional to 749.62, 1,124.69 and 311.11 is: 466.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.62 : 1,124.69 = 311.11 : x
  2. Step 2: Convert to fraction form
    749.62/1,124.69 = 311.11/x
  3. Step 3: Cross multiply
    749.62x = 1,124.69 × 311.11
  4. Step 4: Simplify right side
    749.62x = 349,902.31
  5. Step 5: Solve for x
    x = 349,902.31/749.62
  6. Step 6: Final answer
    x = 466.77

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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.