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Finding the Fourth Proportional to 749.12, 1,121.61 and 383.12

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Solution

The fourth proportional to 749.12, 1,121.61 and 383.12 is: 573.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.12 : 1,121.61 = 383.12 : x
  2. Step 2: Convert to fraction form
    749.12/1,121.61 = 383.12/x
  3. Step 3: Cross multiply
    749.12x = 1,121.61 × 383.12
  4. Step 4: Simplify right side
    749.12x = 429,711.22
  5. Step 5: Solve for x
    x = 429,711.22/749.12
  6. Step 6: Final answer
    x = 573.62

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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.