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Finding the Fourth Proportional to 2,147.70, 3,221.51 and 686.84

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Solution

The fourth proportional to 2,147.70, 3,221.51 and 686.84 is: 1,030.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,147.70 : 3,221.51 = 686.84 : x
  2. Step 2: Convert to fraction form
    2,147.70/3,221.51 = 686.84/x
  3. Step 3: Cross multiply
    2,147.70x = 3,221.51 × 686.84
  4. Step 4: Simplify right side
    2,147.70x = 2,212,661.93
  5. Step 5: Solve for x
    x = 2,212,661.93/2,147.70
  6. Step 6: Final answer
    x = 1,030.25

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1.5x scale

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.