Home / 1,439.65-1,987.67-1,107.49

Finding the Fourth Proportional to 1,439.65, 1,987.67 and 1,107.49

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Solution

The fourth proportional to 1,439.65, 1,987.67 and 1,107.49 is: 1,529.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.65 : 1,987.67 = 1,107.49 : x
  2. Step 2: Convert to fraction form
    1,439.65/1,987.67 = 1,107.49/x
  3. Step 3: Cross multiply
    1,439.65x = 1,987.67 × 1,107.49
  4. Step 4: Simplify right side
    1,439.65x = 2,201,324.65
  5. Step 5: Solve for x
    x = 2,201,324.65/1,439.65
  6. Step 6: Final answer
    x = 1,529.07

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1.5x scale

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.