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Finding the Fourth Proportional to 540.50, 811.09 and 215.90

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Solution

The fourth proportional to 540.50, 811.09 and 215.90 is: 323.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    540.50 : 811.09 = 215.90 : x
  2. Step 2: Convert to fraction form
    540.50/811.09 = 215.90/x
  3. Step 3: Cross multiply
    540.50x = 811.09 × 215.90
  4. Step 4: Simplify right side
    540.50x = 175,110.28
  5. Step 5: Solve for x
    x = 175,110.28/540.50
  6. Step 6: Final answer
    x = 323.98

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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.