Home / 1,428.87-1,981.85-1,370.55

Finding the Fourth Proportional to 1,428.87, 1,981.85 and 1,370.55

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Solution

The fourth proportional to 1,428.87, 1,981.85 and 1,370.55 is: 1,900.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.87 : 1,981.85 = 1,370.55 : x
  2. Step 2: Convert to fraction form
    1,428.87/1,981.85 = 1,370.55/x
  3. Step 3: Cross multiply
    1,428.87x = 1,981.85 × 1,370.55
  4. Step 4: Simplify right side
    1,428.87x = 2,716,227.94
  5. Step 5: Solve for x
    x = 2,716,227.94/1,428.87
  6. Step 6: Final answer
    x = 1,900.96

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.