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Finding the Fourth Proportional to 808.50, 1,212.40 and 397.76

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Solution

The fourth proportional to 808.50, 1,212.40 and 397.76 is: 596.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.50 : 1,212.40 = 397.76 : x
  2. Step 2: Convert to fraction form
    808.50/1,212.40 = 397.76/x
  3. Step 3: Cross multiply
    808.50x = 1,212.40 × 397.76
  4. Step 4: Simplify right side
    808.50x = 482,244.22
  5. Step 5: Solve for x
    x = 482,244.22/808.50
  6. Step 6: Final answer
    x = 596.47

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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.