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Finding the Fourth Proportional to 808.58, 1,212.62 and 418.46

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Solution

The fourth proportional to 808.58, 1,212.62 and 418.46 is: 627.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.58 : 1,212.62 = 418.46 : x
  2. Step 2: Convert to fraction form
    808.58/1,212.62 = 418.46/x
  3. Step 3: Cross multiply
    808.58x = 1,212.62 × 418.46
  4. Step 4: Simplify right side
    808.58x = 507,432.97
  5. Step 5: Solve for x
    x = 507,432.97/808.58
  6. Step 6: Final answer
    x = 627.56

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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.