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Finding the Fourth Proportional to 792.88, 1,189.40 and 215.76

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Solution

The fourth proportional to 792.88, 1,189.40 and 215.76 is: 323.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.88 : 1,189.40 = 215.76 : x
  2. Step 2: Convert to fraction form
    792.88/1,189.40 = 215.76/x
  3. Step 3: Cross multiply
    792.88x = 1,189.40 × 215.76
  4. Step 4: Simplify right side
    792.88x = 256,624.94
  5. Step 5: Solve for x
    x = 256,624.94/792.88
  6. Step 6: Final answer
    x = 323.66

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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.