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Finding the Fourth Proportional to 515.80, 774.02 and 191.40

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Solution

The fourth proportional to 515.80, 774.02 and 191.40 is: 287.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.80 : 774.02 = 191.40 : x
  2. Step 2: Convert to fraction form
    515.80/774.02 = 191.40/x
  3. Step 3: Cross multiply
    515.80x = 774.02 × 191.40
  4. Step 4: Simplify right side
    515.80x = 148,145.00
  5. Step 5: Solve for x
    x = 148,145.00/515.80
  6. Step 6: Final answer
    x = 287.21

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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.