Home / 1,391.04-2,087.91-742.23

Finding the Fourth Proportional to 1,391.04, 2,087.91 and 742.23

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Solution

The fourth proportional to 1,391.04, 2,087.91 and 742.23 is: 1,114.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.04 : 2,087.91 = 742.23 : x
  2. Step 2: Convert to fraction form
    1,391.04/2,087.91 = 742.23/x
  3. Step 3: Cross multiply
    1,391.04x = 2,087.91 × 742.23
  4. Step 4: Simplify right side
    1,391.04x = 1,549,709.44
  5. Step 5: Solve for x
    x = 1,549,709.44/1,391.04
  6. Step 6: Final answer
    x = 1,114.07

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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.