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Finding the Fourth Proportional to 1,887.32, 2,831.39 and 791.06

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Solution

The fourth proportional to 1,887.32, 2,831.39 and 791.06 is: 1,186.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,887.32 : 2,831.39 = 791.06 : x
  2. Step 2: Convert to fraction form
    1,887.32/2,831.39 = 791.06/x
  3. Step 3: Cross multiply
    1,887.32x = 2,831.39 × 791.06
  4. Step 4: Simplify right side
    1,887.32x = 2,239,784.23
  5. Step 5: Solve for x
    x = 2,239,784.23/1,887.32
  6. Step 6: Final answer
    x = 1,186.75

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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.