Home / 1,391.15-2,087.67-742.34

Finding the Fourth Proportional to 1,391.15, 2,087.67 and 742.34

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Solution

The fourth proportional to 1,391.15, 2,087.67 and 742.34 is: 1,114.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.15 : 2,087.67 = 742.34 : x
  2. Step 2: Convert to fraction form
    1,391.15/2,087.67 = 742.34/x
  3. Step 3: Cross multiply
    1,391.15x = 2,087.67 × 742.34
  4. Step 4: Simplify right side
    1,391.15x = 1,549,760.95
  5. Step 5: Solve for x
    x = 1,549,760.95/1,391.15
  6. Step 6: Final answer
    x = 1,114.01

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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.