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Finding the Fourth Proportional to 517.80, 777.18 and 355.08

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Solution

The fourth proportional to 517.80, 777.18 and 355.08 is: 532.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.80 : 777.18 = 355.08 : x
  2. Step 2: Convert to fraction form
    517.80/777.18 = 355.08/x
  3. Step 3: Cross multiply
    517.80x = 777.18 × 355.08
  4. Step 4: Simplify right side
    517.80x = 275,961.07
  5. Step 5: Solve for x
    x = 275,961.07/517.80
  6. Step 6: Final answer
    x = 532.95

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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.