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Finding the Fourth Proportional to 270.91, 405.60 and 210.75

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Solution

The fourth proportional to 270.91, 405.60 and 210.75 is: 315.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.91 : 405.60 = 210.75 : x
  2. Step 2: Convert to fraction form
    270.91/405.60 = 210.75/x
  3. Step 3: Cross multiply
    270.91x = 405.60 × 210.75
  4. Step 4: Simplify right side
    270.91x = 85,478.17
  5. Step 5: Solve for x
    x = 85,478.17/270.91
  6. Step 6: Final answer
    x = 315.52

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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.