Home / 1,428.64-2,139.85-1,393.79

Finding the Fourth Proportional to 1,428.64, 2,139.85 and 1,393.79

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Solution

The fourth proportional to 1,428.64, 2,139.85 and 1,393.79 is: 2,087.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.64 : 2,139.85 = 1,393.79 : x
  2. Step 2: Convert to fraction form
    1,428.64/2,139.85 = 1,393.79/x
  3. Step 3: Cross multiply
    1,428.64x = 2,139.85 × 1,393.79
  4. Step 4: Simplify right side
    1,428.64x = 2,982,501.53
  5. Step 5: Solve for x
    x = 2,982,501.53/1,428.64
  6. Step 6: Final answer
    x = 2,087.65

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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.