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Finding the Fourth Proportional to 891.21, 1,337.32 and 480.34

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Solution

The fourth proportional to 891.21, 1,337.32 and 480.34 is: 720.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.21 : 1,337.32 = 480.34 : x
  2. Step 2: Convert to fraction form
    891.21/1,337.32 = 480.34/x
  3. Step 3: Cross multiply
    891.21x = 1,337.32 × 480.34
  4. Step 4: Simplify right side
    891.21x = 642,368.29
  5. Step 5: Solve for x
    x = 642,368.29/891.21
  6. Step 6: Final answer
    x = 720.78

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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.