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Finding the Fourth Proportional to 842.88, 1,161.60 and 817.92

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Solution

The fourth proportional to 842.88, 1,161.60 and 817.92 is: 1,127.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.88 : 1,161.60 = 817.92 : x
  2. Step 2: Convert to fraction form
    842.88/1,161.60 = 817.92/x
  3. Step 3: Cross multiply
    842.88x = 1,161.60 × 817.92
  4. Step 4: Simplify right side
    842.88x = 950,095.87
  5. Step 5: Solve for x
    x = 950,095.87/842.88
  6. Step 6: Final answer
    x = 1,127.20

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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.