Home / 1,428.40-2,146.20-908.65

Finding the Fourth Proportional to 1,428.40, 2,146.20 and 908.65

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Solution

The fourth proportional to 1,428.40, 2,146.20 and 908.65 is: 1,365.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.40 : 2,146.20 = 908.65 : x
  2. Step 2: Convert to fraction form
    1,428.40/2,146.20 = 908.65/x
  3. Step 3: Cross multiply
    1,428.40x = 2,146.20 × 908.65
  4. Step 4: Simplify right side
    1,428.40x = 1,950,144.63
  5. Step 5: Solve for x
    x = 1,950,144.63/1,428.40
  6. Step 6: Final answer
    x = 1,365.27

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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.