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Finding the Fourth Proportional to 858.72, 1,287.92 and 550.56

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Solution

The fourth proportional to 858.72, 1,287.92 and 550.56 is: 825.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.72 : 1,287.92 = 550.56 : x
  2. Step 2: Convert to fraction form
    858.72/1,287.92 = 550.56/x
  3. Step 3: Cross multiply
    858.72x = 1,287.92 × 550.56
  4. Step 4: Simplify right side
    858.72x = 709,077.24
  5. Step 5: Solve for x
    x = 709,077.24/858.72
  6. Step 6: Final answer
    x = 825.74

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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.