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Finding the Fourth Proportional to 1,118.37, 1,679.39 and 688.26

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Solution

The fourth proportional to 1,118.37, 1,679.39 and 688.26 is: 1,033.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.37 : 1,679.39 = 688.26 : x
  2. Step 2: Convert to fraction form
    1,118.37/1,679.39 = 688.26/x
  3. Step 3: Cross multiply
    1,118.37x = 1,679.39 × 688.26
  4. Step 4: Simplify right side
    1,118.37x = 1,155,853.52
  5. Step 5: Solve for x
    x = 1,155,853.52/1,118.37
  6. Step 6: Final answer
    x = 1,033.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.