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Finding the Fourth Proportional to 1,387.58, 2,081.48 and 693.54

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Solution

The fourth proportional to 1,387.58, 2,081.48 and 693.54 is: 1,040.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.58 : 2,081.48 = 693.54 : x
  2. Step 2: Convert to fraction form
    1,387.58/2,081.48 = 693.54/x
  3. Step 3: Cross multiply
    1,387.58x = 2,081.48 × 693.54
  4. Step 4: Simplify right side
    1,387.58x = 1,443,589.64
  5. Step 5: Solve for x
    x = 1,443,589.64/1,387.58
  6. Step 6: Final answer
    x = 1,040.36

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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.