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Finding the Fourth Proportional to 886.91, 1,224.06 and 639.05

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Solution

The fourth proportional to 886.91, 1,224.06 and 639.05 is: 881.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.91 : 1,224.06 = 639.05 : x
  2. Step 2: Convert to fraction form
    886.91/1,224.06 = 639.05/x
  3. Step 3: Cross multiply
    886.91x = 1,224.06 × 639.05
  4. Step 4: Simplify right side
    886.91x = 782,235.54
  5. Step 5: Solve for x
    x = 782,235.54/886.91
  6. Step 6: Final answer
    x = 881.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.