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Finding the Fourth Proportional to 813.24, 1,220.58 and 380.64

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Solution

The fourth proportional to 813.24, 1,220.58 and 380.64 is: 571.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.24 : 1,220.58 = 380.64 : x
  2. Step 2: Convert to fraction form
    813.24/1,220.58 = 380.64/x
  3. Step 3: Cross multiply
    813.24x = 1,220.58 × 380.64
  4. Step 4: Simplify right side
    813.24x = 464,601.57
  5. Step 5: Solve for x
    x = 464,601.57/813.24
  6. Step 6: Final answer
    x = 571.30

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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.