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Finding the Fourth Proportional to 1,387.63, 2,079.70 and 694.50

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Solution

The fourth proportional to 1,387.63, 2,079.70 and 694.50 is: 1,040.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.63 : 2,079.70 = 694.50 : x
  2. Step 2: Convert to fraction form
    1,387.63/2,079.70 = 694.50/x
  3. Step 3: Cross multiply
    1,387.63x = 2,079.70 × 694.50
  4. Step 4: Simplify right side
    1,387.63x = 1,444,351.65
  5. Step 5: Solve for x
    x = 1,444,351.65/1,387.63
  6. Step 6: Final answer
    x = 1,040.88

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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.