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Finding the Fourth Proportional to 811.44, 1,118.56 and 636.48

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Solution

The fourth proportional to 811.44, 1,118.56 and 636.48 is: 877.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.44 : 1,118.56 = 636.48 : x
  2. Step 2: Convert to fraction form
    811.44/1,118.56 = 636.48/x
  3. Step 3: Cross multiply
    811.44x = 1,118.56 × 636.48
  4. Step 4: Simplify right side
    811.44x = 711,941.07
  5. Step 5: Solve for x
    x = 711,941.07/811.44
  6. Step 6: Final answer
    x = 877.38

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Double scale
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1.5x scale

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.