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Finding the Fourth Proportional to 811.60, 1,217.14 and 263.68

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Solution

The fourth proportional to 811.60, 1,217.14 and 263.68 is: 395.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.60 : 1,217.14 = 263.68 : x
  2. Step 2: Convert to fraction form
    811.60/1,217.14 = 263.68/x
  3. Step 3: Cross multiply
    811.60x = 1,217.14 × 263.68
  4. Step 4: Simplify right side
    811.60x = 320,935.48
  5. Step 5: Solve for x
    x = 320,935.48/811.60
  6. Step 6: Final answer
    x = 395.44

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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.