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Finding the Fourth Proportional to 1,386.73, 2,076.90 and 691.24

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Solution

The fourth proportional to 1,386.73, 2,076.90 and 691.24 is: 1,035.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.73 : 2,076.90 = 691.24 : x
  2. Step 2: Convert to fraction form
    1,386.73/2,076.90 = 691.24/x
  3. Step 3: Cross multiply
    1,386.73x = 2,076.90 × 691.24
  4. Step 4: Simplify right side
    1,386.73x = 1,435,636.36
  5. Step 5: Solve for x
    x = 1,435,636.36/1,386.73
  6. Step 6: Final answer
    x = 1,035.27

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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.