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Finding the Fourth Proportional to 540.70, 810.11 and 385.85

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Solution

The fourth proportional to 540.70, 810.11 and 385.85 is: 578.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    540.70 : 810.11 = 385.85 : x
  2. Step 2: Convert to fraction form
    540.70/810.11 = 385.85/x
  3. Step 3: Cross multiply
    540.70x = 810.11 × 385.85
  4. Step 4: Simplify right side
    540.70x = 312,583.93
  5. Step 5: Solve for x
    x = 312,583.93/540.70
  6. Step 6: Final answer
    x = 578.11

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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.