Home / 2,139.18-3,209.19-906.58

Finding the Fourth Proportional to 2,139.18, 3,209.19 and 906.58

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Solution

The fourth proportional to 2,139.18, 3,209.19 and 906.58 is: 1,360.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.18 : 3,209.19 = 906.58 : x
  2. Step 2: Convert to fraction form
    2,139.18/3,209.19 = 906.58/x
  3. Step 3: Cross multiply
    2,139.18x = 3,209.19 × 906.58
  4. Step 4: Simplify right side
    2,139.18x = 2,909,387.47
  5. Step 5: Solve for x
    x = 2,909,387.47/2,139.18
  6. Step 6: Final answer
    x = 1,360.05

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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.