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Finding the Fourth Proportional to 2,086, 3,127.79 and 915.96

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Solution

The fourth proportional to 2,086, 3,127.79 and 915.96 is: 1,373.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,086 : 3,127.79 = 915.96 : x
  2. Step 2: Convert to fraction form
    2,086/3,127.79 = 915.96/x
  3. Step 3: Cross multiply
    2,086x = 3,127.79 × 915.96
  4. Step 4: Simplify right side
    2,086x = 2,864,910.31
  5. Step 5: Solve for x
    x = 2,864,910.31/2,086
  6. Step 6: Final answer
    x = 1,373.40

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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.