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Finding the Fourth Proportional to 891.16, 1,336.73 and 313.90

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Solution

The fourth proportional to 891.16, 1,336.73 and 313.90 is: 470.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.16 : 1,336.73 = 313.90 : x
  2. Step 2: Convert to fraction form
    891.16/1,336.73 = 313.90/x
  3. Step 3: Cross multiply
    891.16x = 1,336.73 × 313.90
  4. Step 4: Simplify right side
    891.16x = 419,599.55
  5. Step 5: Solve for x
    x = 419,599.55/891.16
  6. Step 6: Final answer
    x = 470.85

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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.