Home / 1,431.98-2,128.66-1,389.94

Finding the Fourth Proportional to 1,431.98, 2,128.66 and 1,389.94

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Solution

The fourth proportional to 1,431.98, 2,128.66 and 1,389.94 is: 2,066.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.98 : 2,128.66 = 1,389.94 : x
  2. Step 2: Convert to fraction form
    1,431.98/2,128.66 = 1,389.94/x
  3. Step 3: Cross multiply
    1,431.98x = 2,128.66 × 1,389.94
  4. Step 4: Simplify right side
    1,431.98x = 2,958,709.68
  5. Step 5: Solve for x
    x = 2,958,709.68/1,431.98
  6. Step 6: Final answer
    x = 2,066.17

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.