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Finding the Fourth Proportional to 813.12, 1,219.68 and 401.84

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Solution

The fourth proportional to 813.12, 1,219.68 and 401.84 is: 602.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.12 : 1,219.68 = 401.84 : x
  2. Step 2: Convert to fraction form
    813.12/1,219.68 = 401.84/x
  3. Step 3: Cross multiply
    813.12x = 1,219.68 × 401.84
  4. Step 4: Simplify right side
    813.12x = 490,119.26
  5. Step 5: Solve for x
    x = 490,119.26/813.12
  6. Step 6: Final answer
    x = 602.76

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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.