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Finding the Fourth Proportional to 540.15, 810.86 and 518.15

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Solution

The fourth proportional to 540.15, 810.86 and 518.15 is: 777.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    540.15 : 810.86 = 518.15 : x
  2. Step 2: Convert to fraction form
    540.15/810.86 = 518.15/x
  3. Step 3: Cross multiply
    540.15x = 810.86 × 518.15
  4. Step 4: Simplify right side
    540.15x = 420,140.46
  5. Step 5: Solve for x
    x = 420,140.46/540.15
  6. Step 6: Final answer
    x = 777.82

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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.