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Finding the Fourth Proportional to 885.40, 1,221.99 and 637.54

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Solution

The fourth proportional to 885.40, 1,221.99 and 637.54 is: 879.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.40 : 1,221.99 = 637.54 : x
  2. Step 2: Convert to fraction form
    885.40/1,221.99 = 637.54/x
  3. Step 3: Cross multiply
    885.40x = 1,221.99 × 637.54
  4. Step 4: Simplify right side
    885.40x = 779,067.50
  5. Step 5: Solve for x
    x = 779,067.50/885.40
  6. Step 6: Final answer
    x = 879.90

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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.