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Finding the Fourth Proportional to 1,241.25, 1,712.85 and 681.69

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Solution

The fourth proportional to 1,241.25, 1,712.85 and 681.69 is: 940.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,241.25 : 1,712.85 = 681.69 : x
  2. Step 2: Convert to fraction form
    1,241.25/1,712.85 = 681.69/x
  3. Step 3: Cross multiply
    1,241.25x = 1,712.85 × 681.69
  4. Step 4: Simplify right side
    1,241.25x = 1,167,631.77
  5. Step 5: Solve for x
    x = 1,167,631.77/1,241.25
  6. Step 6: Final answer
    x = 940.69

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Half scale
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Double scale
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1.5x scale

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.