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Finding the Fourth Proportional to 813.32, 1,219.06 and 379.56

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Solution

The fourth proportional to 813.32, 1,219.06 and 379.56 is: 568.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.32 : 1,219.06 = 379.56 : x
  2. Step 2: Convert to fraction form
    813.32/1,219.06 = 379.56/x
  3. Step 3: Cross multiply
    813.32x = 1,219.06 × 379.56
  4. Step 4: Simplify right side
    813.32x = 462,706.41
  5. Step 5: Solve for x
    x = 462,706.41/813.32
  6. Step 6: Final answer
    x = 568.91

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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.