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Finding the Fourth Proportional to 814.64, 1,221.81 and 266.81

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Solution

The fourth proportional to 814.64, 1,221.81 and 266.81 is: 400.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.64 : 1,221.81 = 266.81 : x
  2. Step 2: Convert to fraction form
    814.64/1,221.81 = 266.81/x
  3. Step 3: Cross multiply
    814.64x = 1,221.81 × 266.81
  4. Step 4: Simplify right side
    814.64x = 325,985.02
  5. Step 5: Solve for x
    x = 325,985.02/814.64
  6. Step 6: Final answer
    x = 400.16

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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.