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Finding the Fourth Proportional to 270.33, 405.45 and 87.70

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Solution

The fourth proportional to 270.33, 405.45 and 87.70 is: 131.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.33 : 405.45 = 87.70 : x
  2. Step 2: Convert to fraction form
    270.33/405.45 = 87.70/x
  3. Step 3: Cross multiply
    270.33x = 405.45 × 87.70
  4. Step 4: Simplify right side
    270.33x = 35,557.71
  5. Step 5: Solve for x
    x = 35,557.71/270.33
  6. Step 6: Final answer
    x = 131.54

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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.