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Finding the Fourth Proportional to 1,221.55, 1,685.73 and 662.02

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Solution

The fourth proportional to 1,221.55, 1,685.73 and 662.02 is: 913.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.55 : 1,685.73 = 662.02 : x
  2. Step 2: Convert to fraction form
    1,221.55/1,685.73 = 662.02/x
  3. Step 3: Cross multiply
    1,221.55x = 1,685.73 × 662.02
  4. Step 4: Simplify right side
    1,221.55x = 1,115,986.97
  5. Step 5: Solve for x
    x = 1,115,986.97/1,221.55
  6. Step 6: Final answer
    x = 913.58

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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.