Home / 1,291.30-1,937.64-1,221.61

Finding the Fourth Proportional to 1,291.30, 1,937.64 and 1,221.61

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Solution

The fourth proportional to 1,291.30, 1,937.64 and 1,221.61 is: 1,833.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.30 : 1,937.64 = 1,221.61 : x
  2. Step 2: Convert to fraction form
    1,291.30/1,937.64 = 1,221.61/x
  3. Step 3: Cross multiply
    1,291.30x = 1,937.64 × 1,221.61
  4. Step 4: Simplify right side
    1,291.30x = 2,367,040.40
  5. Step 5: Solve for x
    x = 2,367,040.40/1,291.30
  6. Step 6: Final answer
    x = 1,833.07

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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.