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Finding the Fourth Proportional to 890.88, 1,336.90 and 480.31

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Solution

The fourth proportional to 890.88, 1,336.90 and 480.31 is: 720.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.88 : 1,336.90 = 480.31 : x
  2. Step 2: Convert to fraction form
    890.88/1,336.90 = 480.31/x
  3. Step 3: Cross multiply
    890.88x = 1,336.90 × 480.31
  4. Step 4: Simplify right side
    890.88x = 642,121.90
  5. Step 5: Solve for x
    x = 642,121.90/890.88
  6. Step 6: Final answer
    x = 720.77

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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.