Home / 1,431.11-2,146.86-391.15

Finding the Fourth Proportional to 1,431.11, 2,146.86 and 391.15

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Solution

The fourth proportional to 1,431.11, 2,146.86 and 391.15 is: 586.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.11 : 2,146.86 = 391.15 : x
  2. Step 2: Convert to fraction form
    1,431.11/2,146.86 = 391.15/x
  3. Step 3: Cross multiply
    1,431.11x = 2,146.86 × 391.15
  4. Step 4: Simplify right side
    1,431.11x = 839,738.92
  5. Step 5: Solve for x
    x = 839,738.92/1,431.11
  6. Step 6: Final answer
    x = 586.77

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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.