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Finding the Fourth Proportional to 886.03, 1,222.80 and 664.60

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Solution

The fourth proportional to 886.03, 1,222.80 and 664.60 is: 917.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.03 : 1,222.80 = 664.60 : x
  2. Step 2: Convert to fraction form
    886.03/1,222.80 = 664.60/x
  3. Step 3: Cross multiply
    886.03x = 1,222.80 × 664.60
  4. Step 4: Simplify right side
    886.03x = 812,672.88
  5. Step 5: Solve for x
    x = 812,672.88/886.03
  6. Step 6: Final answer
    x = 917.21

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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.