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Finding the Fourth Proportional to 270.40, 405.66 and 87.79

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Solution

The fourth proportional to 270.40, 405.66 and 87.79 is: 131.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.40 : 405.66 = 87.79 : x
  2. Step 2: Convert to fraction form
    270.40/405.66 = 87.79/x
  3. Step 3: Cross multiply
    270.40x = 405.66 × 87.79
  4. Step 4: Simplify right side
    270.40x = 35,610.86
  5. Step 5: Solve for x
    x = 35,610.86/270.40
  6. Step 6: Final answer
    x = 131.70

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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.