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Finding the Fourth Proportional to 1,274.01, 1,911.72 and 689

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Solution

The fourth proportional to 1,274.01, 1,911.72 and 689 is: 1,033.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.01 : 1,911.72 = 689 : x
  2. Step 2: Convert to fraction form
    1,274.01/1,911.72 = 689/x
  3. Step 3: Cross multiply
    1,274.01x = 1,911.72 × 689
  4. Step 4: Simplify right side
    1,274.01x = 1,317,175.08
  5. Step 5: Solve for x
    x = 1,317,175.08/1,274.01
  6. Step 6: Final answer
    x = 1,033.88

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Half scale
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Double scale
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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.