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Finding the Fourth Proportional to 885.97, 1,222.76 and 638.11

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Solution

The fourth proportional to 885.97, 1,222.76 and 638.11 is: 880.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.97 : 1,222.76 = 638.11 : x
  2. Step 2: Convert to fraction form
    885.97/1,222.76 = 638.11/x
  3. Step 3: Cross multiply
    885.97x = 1,222.76 × 638.11
  4. Step 4: Simplify right side
    885.97x = 780,255.38
  5. Step 5: Solve for x
    x = 780,255.38/885.97
  6. Step 6: Final answer
    x = 880.68

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.