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Finding the Fourth Proportional to 994.38, 1,491.54 and 345.12

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Solution

The fourth proportional to 994.38, 1,491.54 and 345.12 is: 517.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.38 : 1,491.54 = 345.12 : x
  2. Step 2: Convert to fraction form
    994.38/1,491.54 = 345.12/x
  3. Step 3: Cross multiply
    994.38x = 1,491.54 × 345.12
  4. Step 4: Simplify right side
    994.38x = 514,760.28
  5. Step 5: Solve for x
    x = 514,760.28/994.38
  6. Step 6: Final answer
    x = 517.67

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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.