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Finding the Fourth Proportional to 749.72, 1,124.66 and 316.82

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Solution

The fourth proportional to 749.72, 1,124.66 and 316.82 is: 475.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.72 : 1,124.66 = 316.82 : x
  2. Step 2: Convert to fraction form
    749.72/1,124.66 = 316.82/x
  3. Step 3: Cross multiply
    749.72x = 1,124.66 × 316.82
  4. Step 4: Simplify right side
    749.72x = 356,314.78
  5. Step 5: Solve for x
    x = 356,314.78/749.72
  6. Step 6: Final answer
    x = 475.26

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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.