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Finding the Fourth Proportional to 1,387.96, 2,080.50 and 1,192.48

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Solution

The fourth proportional to 1,387.96, 2,080.50 and 1,192.48 is: 1,787.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.96 : 2,080.50 = 1,192.48 : x
  2. Step 2: Convert to fraction form
    1,387.96/2,080.50 = 1,192.48/x
  3. Step 3: Cross multiply
    1,387.96x = 2,080.50 × 1,192.48
  4. Step 4: Simplify right side
    1,387.96x = 2,480,954.64
  5. Step 5: Solve for x
    x = 2,480,954.64/1,387.96
  6. Step 6: Final answer
    x = 1,787.48

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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.