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Finding the Fourth Proportional to 891.18, 1,336.80 and 718.86

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Solution

The fourth proportional to 891.18, 1,336.80 and 718.86 is: 1,078.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.18 : 1,336.80 = 718.86 : x
  2. Step 2: Convert to fraction form
    891.18/1,336.80 = 718.86/x
  3. Step 3: Cross multiply
    891.18x = 1,336.80 × 718.86
  4. Step 4: Simplify right side
    891.18x = 960,972.05
  5. Step 5: Solve for x
    x = 960,972.05/891.18
  6. Step 6: Final answer
    x = 1,078.31

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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.