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Finding the Fourth Proportional to 1,387.33, 2,080.86 and 693.43

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Solution

The fourth proportional to 1,387.33, 2,080.86 and 693.43 is: 1,040.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.33 : 2,080.86 = 693.43 : x
  2. Step 2: Convert to fraction form
    1,387.33/2,080.86 = 693.43/x
  3. Step 3: Cross multiply
    1,387.33x = 2,080.86 × 693.43
  4. Step 4: Simplify right side
    1,387.33x = 1,442,930.75
  5. Step 5: Solve for x
    x = 1,442,930.75/1,387.33
  6. Step 6: Final answer
    x = 1,040.08

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1.5x scale

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.