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Finding the Fourth Proportional to 792.79, 1,189.18 and 215.66

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Solution

The fourth proportional to 792.79, 1,189.18 and 215.66 is: 323.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.79 : 1,189.18 = 215.66 : x
  2. Step 2: Convert to fraction form
    792.79/1,189.18 = 215.66/x
  3. Step 3: Cross multiply
    792.79x = 1,189.18 × 215.66
  4. Step 4: Simplify right side
    792.79x = 256,458.56
  5. Step 5: Solve for x
    x = 256,458.56/792.79
  6. Step 6: Final answer
    x = 323.49

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Double scale
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Similar ratio
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1.5x scale

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.