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Finding the Fourth Proportional to 885.38, 1,220.57 and 636.27

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Solution

The fourth proportional to 885.38, 1,220.57 and 636.27 is: 877.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.38 : 1,220.57 = 636.27 : x
  2. Step 2: Convert to fraction form
    885.38/1,220.57 = 636.27/x
  3. Step 3: Cross multiply
    885.38x = 1,220.57 × 636.27
  4. Step 4: Simplify right side
    885.38x = 776,608.89
  5. Step 5: Solve for x
    x = 776,608.89/885.38
  6. Step 6: Final answer
    x = 877.15

Related Problems

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Half scale
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Double scale
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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.