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Finding the Fourth Proportional to 858.11, 1,287.99 and 838.08

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Solution

The fourth proportional to 858.11, 1,287.99 and 838.08 is: 1,257.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.11 : 1,287.99 = 838.08 : x
  2. Step 2: Convert to fraction form
    858.11/1,287.99 = 838.08/x
  3. Step 3: Cross multiply
    858.11x = 1,287.99 × 838.08
  4. Step 4: Simplify right side
    858.11x = 1,079,438.66
  5. Step 5: Solve for x
    x = 1,079,438.66/858.11
  6. Step 6: Final answer
    x = 1,257.93

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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.