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Finding the Fourth Proportional to 858.61, 1,286.09 and 798.47

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Solution

The fourth proportional to 858.61, 1,286.09 and 798.47 is: 1,196.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.61 : 1,286.09 = 798.47 : x
  2. Step 2: Convert to fraction form
    858.61/1,286.09 = 798.47/x
  3. Step 3: Cross multiply
    858.61x = 1,286.09 × 798.47
  4. Step 4: Simplify right side
    858.61x = 1,026,904.28
  5. Step 5: Solve for x
    x = 1,026,904.28/858.61
  6. Step 6: Final answer
    x = 1,196.01

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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.