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Finding the Fourth Proportional to 858.27, 1,287.41 and 338.43

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Solution

The fourth proportional to 858.27, 1,287.41 and 338.43 is: 507.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.27 : 1,287.41 = 338.43 : x
  2. Step 2: Convert to fraction form
    858.27/1,287.41 = 338.43/x
  3. Step 3: Cross multiply
    858.27x = 1,287.41 × 338.43
  4. Step 4: Simplify right side
    858.27x = 435,696.47
  5. Step 5: Solve for x
    x = 435,696.47/858.27
  6. Step 6: Final answer
    x = 507.65

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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.