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Finding the Fourth Proportional to 749.44, 1,123.20 and 316.16

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Solution

The fourth proportional to 749.44, 1,123.20 and 316.16 is: 473.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.44 : 1,123.20 = 316.16 : x
  2. Step 2: Convert to fraction form
    749.44/1,123.20 = 316.16/x
  3. Step 3: Cross multiply
    749.44x = 1,123.20 × 316.16
  4. Step 4: Simplify right side
    749.44x = 355,110.91
  5. Step 5: Solve for x
    x = 355,110.91/749.44
  6. Step 6: Final answer
    x = 473.84

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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.