Home / 1,981.29-2,969.10-1,113.78

Finding the Fourth Proportional to 1,981.29, 2,969.10 and 1,113.78

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Solution

The fourth proportional to 1,981.29, 2,969.10 and 1,113.78 is: 1,669.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.29 : 2,969.10 = 1,113.78 : x
  2. Step 2: Convert to fraction form
    1,981.29/2,969.10 = 1,113.78/x
  3. Step 3: Cross multiply
    1,981.29x = 2,969.10 × 1,113.78
  4. Step 4: Simplify right side
    1,981.29x = 3,306,924.20
  5. Step 5: Solve for x
    x = 3,306,924.20/1,981.29
  6. Step 6: Final answer
    x = 1,669.08

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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.