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Finding the Fourth Proportional to 1,225.97, 1,691 and 783.68

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Solution

The fourth proportional to 1,225.97, 1,691 and 783.68 is: 1,080.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.97 : 1,691 = 783.68 : x
  2. Step 2: Convert to fraction form
    1,225.97/1,691 = 783.68/x
  3. Step 3: Cross multiply
    1,225.97x = 1,691 × 783.68
  4. Step 4: Simplify right side
    1,225.97x = 1,325,202.88
  5. Step 5: Solve for x
    x = 1,325,202.88/1,225.97
  6. Step 6: Final answer
    x = 1,080.94

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Double scale
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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.