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Finding the Fourth Proportional to 521.51, 781.79 and 196.65

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Solution

The fourth proportional to 521.51, 781.79 and 196.65 is: 294.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.51 : 781.79 = 196.65 : x
  2. Step 2: Convert to fraction form
    521.51/781.79 = 196.65/x
  3. Step 3: Cross multiply
    521.51x = 781.79 × 196.65
  4. Step 4: Simplify right side
    521.51x = 153,739.00
  5. Step 5: Solve for x
    x = 153,739.00/521.51
  6. Step 6: Final answer
    x = 294.80

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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.