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Finding the Fourth Proportional to 749.20, 1,123.08 and 316.24

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Solution

The fourth proportional to 749.20, 1,123.08 and 316.24 is: 474.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.20 : 1,123.08 = 316.24 : x
  2. Step 2: Convert to fraction form
    749.20/1,123.08 = 316.24/x
  3. Step 3: Cross multiply
    749.20x = 1,123.08 × 316.24
  4. Step 4: Simplify right side
    749.20x = 355,162.82
  5. Step 5: Solve for x
    x = 355,162.82/749.20
  6. Step 6: Final answer
    x = 474.06

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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.