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Finding the Fourth Proportional to 858.98, 1,290.58 and 550.96

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Solution

The fourth proportional to 858.98, 1,290.58 and 550.96 is: 827.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.98 : 1,290.58 = 550.96 : x
  2. Step 2: Convert to fraction form
    858.98/1,290.58 = 550.96/x
  3. Step 3: Cross multiply
    858.98x = 1,290.58 × 550.96
  4. Step 4: Simplify right side
    858.98x = 711,057.96
  5. Step 5: Solve for x
    x = 711,057.96/858.98
  6. Step 6: Final answer
    x = 827.79

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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.