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Finding the Fourth Proportional to 984.78, 1,358.52 and 872.86

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Solution

The fourth proportional to 984.78, 1,358.52 and 872.86 is: 1,204.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.78 : 1,358.52 = 872.86 : x
  2. Step 2: Convert to fraction form
    984.78/1,358.52 = 872.86/x
  3. Step 3: Cross multiply
    984.78x = 1,358.52 × 872.86
  4. Step 4: Simplify right side
    984.78x = 1,185,797.77
  5. Step 5: Solve for x
    x = 1,185,797.77/984.78
  6. Step 6: Final answer
    x = 1,204.12

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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.