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Finding the Fourth Proportional to 1,238.68, 1,709.40 and 679.12

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Solution

The fourth proportional to 1,238.68, 1,709.40 and 679.12 is: 937.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.68 : 1,709.40 = 679.12 : x
  2. Step 2: Convert to fraction form
    1,238.68/1,709.40 = 679.12/x
  3. Step 3: Cross multiply
    1,238.68x = 1,709.40 × 679.12
  4. Step 4: Simplify right side
    1,238.68x = 1,160,880.96
  5. Step 5: Solve for x
    x = 1,160,880.96/1,238.68
  6. Step 6: Final answer
    x = 937.19

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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.