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Finding the Fourth Proportional to 813.82, 1,221.54 and 553.84

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Solution

The fourth proportional to 813.82, 1,221.54 and 553.84 is: 831.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.82 : 1,221.54 = 553.84 : x
  2. Step 2: Convert to fraction form
    813.82/1,221.54 = 553.84/x
  3. Step 3: Cross multiply
    813.82x = 1,221.54 × 553.84
  4. Step 4: Simplify right side
    813.82x = 676,537.71
  5. Step 5: Solve for x
    x = 676,537.71/813.82
  6. Step 6: Final answer
    x = 831.31

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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.