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Finding the Fourth Proportional to 540.78, 811.50 and 216.10

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Solution

The fourth proportional to 540.78, 811.50 and 216.10 is: 324.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    540.78 : 811.50 = 216.10 : x
  2. Step 2: Convert to fraction form
    540.78/811.50 = 216.10/x
  3. Step 3: Cross multiply
    540.78x = 811.50 × 216.10
  4. Step 4: Simplify right side
    540.78x = 175,365.15
  5. Step 5: Solve for x
    x = 175,365.15/540.78
  6. Step 6: Final answer
    x = 324.28

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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.