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Finding the Fourth Proportional to 889.92, 1,336.28 and 479.86

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Solution

The fourth proportional to 889.92, 1,336.28 and 479.86 is: 720.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.92 : 1,336.28 = 479.86 : x
  2. Step 2: Convert to fraction form
    889.92/1,336.28 = 479.86/x
  3. Step 3: Cross multiply
    889.92x = 1,336.28 × 479.86
  4. Step 4: Simplify right side
    889.92x = 641,221.58
  5. Step 5: Solve for x
    x = 641,221.58/889.92
  6. Step 6: Final answer
    x = 720.54

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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.