Home / 2,148.11-3,221.95-686.87

Finding the Fourth Proportional to 2,148.11, 3,221.95 and 686.87

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Solution

The fourth proportional to 2,148.11, 3,221.95 and 686.87 is: 1,030.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,148.11 : 3,221.95 = 686.87 : x
  2. Step 2: Convert to fraction form
    2,148.11/3,221.95 = 686.87/x
  3. Step 3: Cross multiply
    2,148.11x = 3,221.95 × 686.87
  4. Step 4: Simplify right side
    2,148.11x = 2,213,044.69
  5. Step 5: Solve for x
    x = 2,213,044.69/2,148.11
  6. Step 6: Final answer
    x = 1,030.23

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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.