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Finding the Fourth Proportional to 811.16, 1,118.58 and 663.32

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Solution

The fourth proportional to 811.16, 1,118.58 and 663.32 is: 914.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.16 : 1,118.58 = 663.32 : x
  2. Step 2: Convert to fraction form
    811.16/1,118.58 = 663.32/x
  3. Step 3: Cross multiply
    811.16x = 1,118.58 × 663.32
  4. Step 4: Simplify right side
    811.16x = 741,976.49
  5. Step 5: Solve for x
    x = 741,976.49/811.16
  6. Step 6: Final answer
    x = 914.71

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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.