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Finding the Fourth Proportional to 1,887.22, 2,831.31 and 861.94

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Solution

The fourth proportional to 1,887.22, 2,831.31 and 861.94 is: 1,293.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,887.22 : 2,831.31 = 861.94 : x
  2. Step 2: Convert to fraction form
    1,887.22/2,831.31 = 861.94/x
  3. Step 3: Cross multiply
    1,887.22x = 2,831.31 × 861.94
  4. Step 4: Simplify right side
    1,887.22x = 2,440,419.34
  5. Step 5: Solve for x
    x = 2,440,419.34/1,887.22
  6. Step 6: Final answer
    x = 1,293.13

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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.