Home / 1,399.29-2,099.33-425.40

Finding the Fourth Proportional to 1,399.29, 2,099.33 and 425.40

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Solution

The fourth proportional to 1,399.29, 2,099.33 and 425.40 is: 638.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.29 : 2,099.33 = 425.40 : x
  2. Step 2: Convert to fraction form
    1,399.29/2,099.33 = 425.40/x
  3. Step 3: Cross multiply
    1,399.29x = 2,099.33 × 425.40
  4. Step 4: Simplify right side
    1,399.29x = 893,054.98
  5. Step 5: Solve for x
    x = 893,054.98/1,399.29
  6. Step 6: Final answer
    x = 638.22

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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.