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Finding the Fourth Proportional to 885.97, 1,220.84 and 685.58

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Solution

The fourth proportional to 885.97, 1,220.84 and 685.58 is: 944.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.97 : 1,220.84 = 685.58 : x
  2. Step 2: Convert to fraction form
    885.97/1,220.84 = 685.58/x
  3. Step 3: Cross multiply
    885.97x = 1,220.84 × 685.58
  4. Step 4: Simplify right side
    885.97x = 836,983.49
  5. Step 5: Solve for x
    x = 836,983.49/885.97
  6. Step 6: Final answer
    x = 944.71

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1.5x scale

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.