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Finding the Fourth Proportional to 749.65, 1,124.39 and 316.75

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Solution

The fourth proportional to 749.65, 1,124.39 and 316.75 is: 475.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.65 : 1,124.39 = 316.75 : x
  2. Step 2: Convert to fraction form
    749.65/1,124.39 = 316.75/x
  3. Step 3: Cross multiply
    749.65x = 1,124.39 × 316.75
  4. Step 4: Simplify right side
    749.65x = 356,148.95
  5. Step 5: Solve for x
    x = 356,148.95/749.65
  6. Step 6: Final answer
    x = 475.09

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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.