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Finding the Fourth Proportional to 813.88, 1,221.28 and 351.76

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Solution

The fourth proportional to 813.88, 1,221.28 and 351.76 is: 527.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.88 : 1,221.28 = 351.76 : x
  2. Step 2: Convert to fraction form
    813.88/1,221.28 = 351.76/x
  3. Step 3: Cross multiply
    813.88x = 1,221.28 × 351.76
  4. Step 4: Simplify right side
    813.88x = 429,597.45
  5. Step 5: Solve for x
    x = 429,597.45/813.88
  6. Step 6: Final answer
    x = 527.84

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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.