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Finding the Fourth Proportional to 885.38, 1,221.90 and 536

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Solution

The fourth proportional to 885.38, 1,221.90 and 536 is: 739.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.38 : 1,221.90 = 536 : x
  2. Step 2: Convert to fraction form
    885.38/1,221.90 = 536/x
  3. Step 3: Cross multiply
    885.38x = 1,221.90 × 536
  4. Step 4: Simplify right side
    885.38x = 654,938.40
  5. Step 5: Solve for x
    x = 654,938.40/885.38
  6. Step 6: Final answer
    x = 739.73

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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.