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Finding the Fourth Proportional to 858.80, 1,285.14 and 674.93

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Solution

The fourth proportional to 858.80, 1,285.14 and 674.93 is: 1,009.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.80 : 1,285.14 = 674.93 : x
  2. Step 2: Convert to fraction form
    858.80/1,285.14 = 674.93/x
  3. Step 3: Cross multiply
    858.80x = 1,285.14 × 674.93
  4. Step 4: Simplify right side
    858.80x = 867,379.54
  5. Step 5: Solve for x
    x = 867,379.54/858.80
  6. Step 6: Final answer
    x = 1,009.99

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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.