Home / 1,381.89-2,072.82-1,312.68

Finding the Fourth Proportional to 1,381.89, 2,072.82 and 1,312.68

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Solution

The fourth proportional to 1,381.89, 2,072.82 and 1,312.68 is: 1,969.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.89 : 2,072.82 = 1,312.68 : x
  2. Step 2: Convert to fraction form
    1,381.89/2,072.82 = 1,312.68/x
  3. Step 3: Cross multiply
    1,381.89x = 2,072.82 × 1,312.68
  4. Step 4: Simplify right side
    1,381.89x = 2,720,949.36
  5. Step 5: Solve for x
    x = 2,720,949.36/1,381.89
  6. Step 6: Final answer
    x = 1,969.01

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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.