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Finding the Fourth Proportional to 891.40, 1,336.68 and 578.54

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Solution

The fourth proportional to 891.40, 1,336.68 and 578.54 is: 867.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.40 : 1,336.68 = 578.54 : x
  2. Step 2: Convert to fraction form
    891.40/1,336.68 = 578.54/x
  3. Step 3: Cross multiply
    891.40x = 1,336.68 × 578.54
  4. Step 4: Simplify right side
    891.40x = 773,322.85
  5. Step 5: Solve for x
    x = 773,322.85/891.40
  6. Step 6: Final answer
    x = 867.54

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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.