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Finding the Fourth Proportional to 885.27, 1,221.81 and 637.41

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Solution

The fourth proportional to 885.27, 1,221.81 and 637.41 is: 879.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.27 : 1,221.81 = 637.41 : x
  2. Step 2: Convert to fraction form
    885.27/1,221.81 = 637.41/x
  3. Step 3: Cross multiply
    885.27x = 1,221.81 × 637.41
  4. Step 4: Simplify right side
    885.27x = 778,793.91
  5. Step 5: Solve for x
    x = 778,793.91/885.27
  6. Step 6: Final answer
    x = 879.72

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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.