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Finding the Fourth Proportional to 792.58, 1,188.87 and 215.44

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Solution

The fourth proportional to 792.58, 1,188.87 and 215.44 is: 323.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.58 : 1,188.87 = 215.44 : x
  2. Step 2: Convert to fraction form
    792.58/1,188.87 = 215.44/x
  3. Step 3: Cross multiply
    792.58x = 1,188.87 × 215.44
  4. Step 4: Simplify right side
    792.58x = 256,130.15
  5. Step 5: Solve for x
    x = 256,130.15/792.58
  6. Step 6: Final answer
    x = 323.16

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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.