Home / 2,187.20-3,018.12-1,290.92

Finding the Fourth Proportional to 2,187.20, 3,018.12 and 1,290.92

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Solution

The fourth proportional to 2,187.20, 3,018.12 and 1,290.92 is: 1,781.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187.20 : 3,018.12 = 1,290.92 : x
  2. Step 2: Convert to fraction form
    2,187.20/3,018.12 = 1,290.92/x
  3. Step 3: Cross multiply
    2,187.20x = 3,018.12 × 1,290.92
  4. Step 4: Simplify right side
    2,187.20x = 3,896,151.47
  5. Step 5: Solve for x
    x = 3,896,151.47/2,187.20
  6. Step 6: Final answer
    x = 1,781.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.