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Finding the Fourth Proportional to 1,215.68, 1,677.65 and 691.73

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Solution

The fourth proportional to 1,215.68, 1,677.65 and 691.73 is: 954.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.68 : 1,677.65 = 691.73 : x
  2. Step 2: Convert to fraction form
    1,215.68/1,677.65 = 691.73/x
  3. Step 3: Cross multiply
    1,215.68x = 1,677.65 × 691.73
  4. Step 4: Simplify right side
    1,215.68x = 1,160,480.83
  5. Step 5: Solve for x
    x = 1,160,480.83/1,215.68
  6. Step 6: Final answer
    x = 954.59

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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.