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Finding the Fourth Proportional to 520.65, 780.57 and 196.29

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Solution

The fourth proportional to 520.65, 780.57 and 196.29 is: 294.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.65 : 780.57 = 196.29 : x
  2. Step 2: Convert to fraction form
    520.65/780.57 = 196.29/x
  3. Step 3: Cross multiply
    520.65x = 780.57 × 196.29
  4. Step 4: Simplify right side
    520.65x = 153,218.09
  5. Step 5: Solve for x
    x = 153,218.09/520.65
  6. Step 6: Final answer
    x = 294.28

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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.