Home / 2,148.13-3,221.51-686.94

Finding the Fourth Proportional to 2,148.13, 3,221.51 and 686.94

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Solution

The fourth proportional to 2,148.13, 3,221.51 and 686.94 is: 1,030.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,148.13 : 3,221.51 = 686.94 : x
  2. Step 2: Convert to fraction form
    2,148.13/3,221.51 = 686.94/x
  3. Step 3: Cross multiply
    2,148.13x = 3,221.51 × 686.94
  4. Step 4: Simplify right side
    2,148.13x = 2,212,977.74
  5. Step 5: Solve for x
    x = 2,212,977.74/2,148.13
  6. Step 6: Final answer
    x = 1,030.19

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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.