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Finding the Fourth Proportional to 842.15, 1,160.91 and 643.03

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Solution

The fourth proportional to 842.15, 1,160.91 and 643.03 is: 886.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.15 : 1,160.91 = 643.03 : x
  2. Step 2: Convert to fraction form
    842.15/1,160.91 = 643.03/x
  3. Step 3: Cross multiply
    842.15x = 1,160.91 × 643.03
  4. Step 4: Simplify right side
    842.15x = 746,497.06
  5. Step 5: Solve for x
    x = 746,497.06/842.15
  6. Step 6: Final answer
    x = 886.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.