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Finding the Fourth Proportional to 1,221.63, 1,685.87 and 662.11

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Solution

The fourth proportional to 1,221.63, 1,685.87 and 662.11 is: 913.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.63 : 1,685.87 = 662.11 : x
  2. Step 2: Convert to fraction form
    1,221.63/1,685.87 = 662.11/x
  3. Step 3: Cross multiply
    1,221.63x = 1,685.87 × 662.11
  4. Step 4: Simplify right side
    1,221.63x = 1,116,231.39
  5. Step 5: Solve for x
    x = 1,116,231.39/1,221.63
  6. Step 6: Final answer
    x = 913.72

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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.