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Finding the Fourth Proportional to 1,886.83, 2,831.31 and 717.64

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Solution

The fourth proportional to 1,886.83, 2,831.31 and 717.64 is: 1,076.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,886.83 : 2,831.31 = 717.64 : x
  2. Step 2: Convert to fraction form
    1,886.83/2,831.31 = 717.64/x
  3. Step 3: Cross multiply
    1,886.83x = 2,831.31 × 717.64
  4. Step 4: Simplify right side
    1,886.83x = 2,031,861.31
  5. Step 5: Solve for x
    x = 2,031,861.31/1,886.83
  6. Step 6: Final answer
    x = 1,076.87

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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.