Home / 1,387.38-2,078.64-1,236.72

Finding the Fourth Proportional to 1,387.38, 2,078.64 and 1,236.72

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Solution

The fourth proportional to 1,387.38, 2,078.64 and 1,236.72 is: 1,852.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.38 : 2,078.64 = 1,236.72 : x
  2. Step 2: Convert to fraction form
    1,387.38/2,078.64 = 1,236.72/x
  3. Step 3: Cross multiply
    1,387.38x = 2,078.64 × 1,236.72
  4. Step 4: Simplify right side
    1,387.38x = 2,570,695.66
  5. Step 5: Solve for x
    x = 2,570,695.66/1,387.38
  6. Step 6: Final answer
    x = 1,852.91

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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.