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Finding the Fourth Proportional to 808.58, 1,212.87 and 613.98

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Solution

The fourth proportional to 808.58, 1,212.87 and 613.98 is: 920.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.58 : 1,212.87 = 613.98 : x
  2. Step 2: Convert to fraction form
    808.58/1,212.87 = 613.98/x
  3. Step 3: Cross multiply
    808.58x = 1,212.87 × 613.98
  4. Step 4: Simplify right side
    808.58x = 744,677.92
  5. Step 5: Solve for x
    x = 744,677.92/808.58
  6. Step 6: Final answer
    x = 920.98

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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.