Home / 1,291.55-1,939.29-1,138.76

Finding the Fourth Proportional to 1,291.55, 1,939.29 and 1,138.76

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Solution

The fourth proportional to 1,291.55, 1,939.29 and 1,138.76 is: 1,709.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.55 : 1,939.29 = 1,138.76 : x
  2. Step 2: Convert to fraction form
    1,291.55/1,939.29 = 1,138.76/x
  3. Step 3: Cross multiply
    1,291.55x = 1,939.29 × 1,138.76
  4. Step 4: Simplify right side
    1,291.55x = 2,208,385.59
  5. Step 5: Solve for x
    x = 2,208,385.59/1,291.55
  6. Step 6: Final answer
    x = 1,709.88

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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.