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Finding the Fourth Proportional to 885.94, 1,221.69 and 664.54

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Solution

The fourth proportional to 885.94, 1,221.69 and 664.54 is: 916.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.94 : 1,221.69 = 664.54 : x
  2. Step 2: Convert to fraction form
    885.94/1,221.69 = 664.54/x
  3. Step 3: Cross multiply
    885.94x = 1,221.69 × 664.54
  4. Step 4: Simplify right side
    885.94x = 811,861.87
  5. Step 5: Solve for x
    x = 811,861.87/885.94
  6. Step 6: Final answer
    x = 916.38

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.