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Finding the Fourth Proportional to 891.10, 1,336.35 and 618.94

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Solution

The fourth proportional to 891.10, 1,336.35 and 618.94 is: 928.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.10 : 1,336.35 = 618.94 : x
  2. Step 2: Convert to fraction form
    891.10/1,336.35 = 618.94/x
  3. Step 3: Cross multiply
    891.10x = 1,336.35 × 618.94
  4. Step 4: Simplify right side
    891.10x = 827,120.47
  5. Step 5: Solve for x
    x = 827,120.47/891.10
  6. Step 6: Final answer
    x = 928.20

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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.