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Finding the Fourth Proportional to 270.86, 405.94 and 155.40

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Solution

The fourth proportional to 270.86, 405.94 and 155.40 is: 232.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.86 : 405.94 = 155.40 : x
  2. Step 2: Convert to fraction form
    270.86/405.94 = 155.40/x
  3. Step 3: Cross multiply
    270.86x = 405.94 × 155.40
  4. Step 4: Simplify right side
    270.86x = 63,083.08
  5. Step 5: Solve for x
    x = 63,083.08/270.86
  6. Step 6: Final answer
    x = 232.90

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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.