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Finding the Fourth Proportional to 270.70, 405.78 and 148.81

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Solution

The fourth proportional to 270.70, 405.78 and 148.81 is: 223.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.70 : 405.78 = 148.81 : x
  2. Step 2: Convert to fraction form
    270.70/405.78 = 148.81/x
  3. Step 3: Cross multiply
    270.70x = 405.78 × 148.81
  4. Step 4: Simplify right side
    270.70x = 60,384.12
  5. Step 5: Solve for x
    x = 60,384.12/270.70
  6. Step 6: Final answer
    x = 223.07

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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.