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Finding the Fourth Proportional to 814.40, 1,222.44 and 811.52

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Solution

The fourth proportional to 814.40, 1,222.44 and 811.52 is: 1,218.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.40 : 1,222.44 = 811.52 : x
  2. Step 2: Convert to fraction form
    814.40/1,222.44 = 811.52/x
  3. Step 3: Cross multiply
    814.40x = 1,222.44 × 811.52
  4. Step 4: Simplify right side
    814.40x = 992,034.51
  5. Step 5: Solve for x
    x = 992,034.51/814.40
  6. Step 6: Final answer
    x = 1,218.12

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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.