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Finding the Fourth Proportional to 884.40, 1,221.93 and 664.08

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Solution

The fourth proportional to 884.40, 1,221.93 and 664.08 is: 917.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.40 : 1,221.93 = 664.08 : x
  2. Step 2: Convert to fraction form
    884.40/1,221.93 = 664.08/x
  3. Step 3: Cross multiply
    884.40x = 1,221.93 × 664.08
  4. Step 4: Simplify right side
    884.40x = 811,459.27
  5. Step 5: Solve for x
    x = 811,459.27/884.40
  6. Step 6: Final answer
    x = 917.53

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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.