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Finding the Fourth Proportional to 2,139.12, 3,210.22 and 906.88

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Solution

The fourth proportional to 2,139.12, 3,210.22 and 906.88 is: 1,360.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.12 : 3,210.22 = 906.88 : x
  2. Step 2: Convert to fraction form
    2,139.12/3,210.22 = 906.88/x
  3. Step 3: Cross multiply
    2,139.12x = 3,210.22 × 906.88
  4. Step 4: Simplify right side
    2,139.12x = 2,911,284.31
  5. Step 5: Solve for x
    x = 2,911,284.31/2,139.12
  6. Step 6: Final answer
    x = 1,360.97

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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.