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Finding the Fourth Proportional to 886.02, 1,222.80 and 664.56

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Solution

The fourth proportional to 886.02, 1,222.80 and 664.56 is: 917.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.02 : 1,222.80 = 664.56 : x
  2. Step 2: Convert to fraction form
    886.02/1,222.80 = 664.56/x
  3. Step 3: Cross multiply
    886.02x = 1,222.80 × 664.56
  4. Step 4: Simplify right side
    886.02x = 812,623.97
  5. Step 5: Solve for x
    x = 812,623.97/886.02
  6. Step 6: Final answer
    x = 917.16

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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.