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Finding the Fourth Proportional to 842.04, 1,263.60 and 811.80

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Solution

The fourth proportional to 842.04, 1,263.60 and 811.80 is: 1,218.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.04 : 1,263.60 = 811.80 : x
  2. Step 2: Convert to fraction form
    842.04/1,263.60 = 811.80/x
  3. Step 3: Cross multiply
    842.04x = 1,263.60 × 811.80
  4. Step 4: Simplify right side
    842.04x = 1,025,790.48
  5. Step 5: Solve for x
    x = 1,025,790.48/842.04
  6. Step 6: Final answer
    x = 1,218.22

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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.