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Finding the Fourth Proportional to 788.61, 1,181.98 and 326.16

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Solution

The fourth proportional to 788.61, 1,181.98 and 326.16 is: 488.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.61 : 1,181.98 = 326.16 : x
  2. Step 2: Convert to fraction form
    788.61/1,181.98 = 326.16/x
  3. Step 3: Cross multiply
    788.61x = 1,181.98 × 326.16
  4. Step 4: Simplify right side
    788.61x = 385,514.60
  5. Step 5: Solve for x
    x = 385,514.60/788.61
  6. Step 6: Final answer
    x = 488.85

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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.