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Finding the Fourth Proportional to 885.38, 1,222.15 and 664.96

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Solution

The fourth proportional to 885.38, 1,222.15 and 664.96 is: 917.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.38 : 1,222.15 = 664.96 : x
  2. Step 2: Convert to fraction form
    885.38/1,222.15 = 664.96/x
  3. Step 3: Cross multiply
    885.38x = 1,222.15 × 664.96
  4. Step 4: Simplify right side
    885.38x = 812,682.26
  5. Step 5: Solve for x
    x = 812,682.26/885.38
  6. Step 6: Final answer
    x = 917.90

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.