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Finding the Fourth Proportional to 1,387.53, 2,078.46 and 1,340.82

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Solution

The fourth proportional to 1,387.53, 2,078.46 and 1,340.82 is: 2,008.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.53 : 2,078.46 = 1,340.82 : x
  2. Step 2: Convert to fraction form
    1,387.53/2,078.46 = 1,340.82/x
  3. Step 3: Cross multiply
    1,387.53x = 2,078.46 × 1,340.82
  4. Step 4: Simplify right side
    1,387.53x = 2,786,840.74
  5. Step 5: Solve for x
    x = 2,786,840.74/1,387.53
  6. Step 6: Final answer
    x = 2,008.49

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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.