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Finding the Fourth Proportional to 792.60, 1,188.89 and 215.47

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Solution

The fourth proportional to 792.60, 1,188.89 and 215.47 is: 323.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.60 : 1,188.89 = 215.47 : x
  2. Step 2: Convert to fraction form
    792.60/1,188.89 = 215.47/x
  3. Step 3: Cross multiply
    792.60x = 1,188.89 × 215.47
  4. Step 4: Simplify right side
    792.60x = 256,170.13
  5. Step 5: Solve for x
    x = 256,170.13/792.60
  6. Step 6: Final answer
    x = 323.20

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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.