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Finding the Fourth Proportional to 891.40, 1,336.75 and 356.95

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Solution

The fourth proportional to 891.40, 1,336.75 and 356.95 is: 535.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.40 : 1,336.75 = 356.95 : x
  2. Step 2: Convert to fraction form
    891.40/1,336.75 = 356.95/x
  3. Step 3: Cross multiply
    891.40x = 1,336.75 × 356.95
  4. Step 4: Simplify right side
    891.40x = 477,146.23
  5. Step 5: Solve for x
    x = 477,146.23/891.40
  6. Step 6: Final answer
    x = 535.28

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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.