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Finding the Fourth Proportional to 270.69, 405.90 and 126.51

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Solution

The fourth proportional to 270.69, 405.90 and 126.51 is: 189.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.69 : 405.90 = 126.51 : x
  2. Step 2: Convert to fraction form
    270.69/405.90 = 126.51/x
  3. Step 3: Cross multiply
    270.69x = 405.90 × 126.51
  4. Step 4: Simplify right side
    270.69x = 51,350.41
  5. Step 5: Solve for x
    x = 51,350.41/270.69
  6. Step 6: Final answer
    x = 189.70

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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.