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Finding the Fourth Proportional to 885.54, 1,221.12 and 638.04

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Solution

The fourth proportional to 885.54, 1,221.12 and 638.04 is: 879.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.54 : 1,221.12 = 638.04 : x
  2. Step 2: Convert to fraction form
    885.54/1,221.12 = 638.04/x
  3. Step 3: Cross multiply
    885.54x = 1,221.12 × 638.04
  4. Step 4: Simplify right side
    885.54x = 779,123.40
  5. Step 5: Solve for x
    x = 779,123.40/885.54
  6. Step 6: Final answer
    x = 879.83

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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.