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Finding the Fourth Proportional to 862.72, 1,189.90 and 559.96

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Solution

The fourth proportional to 862.72, 1,189.90 and 559.96 is: 772.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.72 : 1,189.90 = 559.96 : x
  2. Step 2: Convert to fraction form
    862.72/1,189.90 = 559.96/x
  3. Step 3: Cross multiply
    862.72x = 1,189.90 × 559.96
  4. Step 4: Simplify right side
    862.72x = 666,287.65
  5. Step 5: Solve for x
    x = 666,287.65/862.72
  6. Step 6: Final answer
    x = 772.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.