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Finding the Fourth Proportional to 520.25, 780.55 and 191.18

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Solution

The fourth proportional to 520.25, 780.55 and 191.18 is: 286.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.25 : 780.55 = 191.18 : x
  2. Step 2: Convert to fraction form
    520.25/780.55 = 191.18/x
  3. Step 3: Cross multiply
    520.25x = 780.55 × 191.18
  4. Step 4: Simplify right side
    520.25x = 149,227.02
  5. Step 5: Solve for x
    x = 149,227.02/520.25
  6. Step 6: Final answer
    x = 286.84

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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.