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Finding the Fourth Proportional to 1,221.82, 1,686.18 and 697.96

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Solution

The fourth proportional to 1,221.82, 1,686.18 and 697.96 is: 963.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.82 : 1,686.18 = 697.96 : x
  2. Step 2: Convert to fraction form
    1,221.82/1,686.18 = 697.96/x
  3. Step 3: Cross multiply
    1,221.82x = 1,686.18 × 697.96
  4. Step 4: Simplify right side
    1,221.82x = 1,176,886.19
  5. Step 5: Solve for x
    x = 1,176,886.19/1,221.82
  6. Step 6: Final answer
    x = 963.22

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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.