Home / 1,428.57-1,967.20-1,397.90

Finding the Fourth Proportional to 1,428.57, 1,967.20 and 1,397.90

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Solution

The fourth proportional to 1,428.57, 1,967.20 and 1,397.90 is: 1,924.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.57 : 1,967.20 = 1,397.90 : x
  2. Step 2: Convert to fraction form
    1,428.57/1,967.20 = 1,397.90/x
  3. Step 3: Cross multiply
    1,428.57x = 1,967.20 × 1,397.90
  4. Step 4: Simplify right side
    1,428.57x = 2,749,950.30
  5. Step 5: Solve for x
    x = 2,749,950.30/1,428.57
  6. Step 6: Final answer
    x = 1,924.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.