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Finding the Fourth Proportional to 813.35, 1,220.01 and 265.91

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Solution

The fourth proportional to 813.35, 1,220.01 and 265.91 is: 398.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.35 : 1,220.01 = 265.91 : x
  2. Step 2: Convert to fraction form
    813.35/1,220.01 = 265.91/x
  3. Step 3: Cross multiply
    813.35x = 1,220.01 × 265.91
  4. Step 4: Simplify right side
    813.35x = 324,406.76
  5. Step 5: Solve for x
    x = 324,406.76/813.35
  6. Step 6: Final answer
    x = 398.86

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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.