Home / 1,125.15-1,687.26-394.55

Finding the Fourth Proportional to 1,125.15, 1,687.26 and 394.55

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Solution

The fourth proportional to 1,125.15, 1,687.26 and 394.55 is: 591.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.15 : 1,687.26 = 394.55 : x
  2. Step 2: Convert to fraction form
    1,125.15/1,687.26 = 394.55/x
  3. Step 3: Cross multiply
    1,125.15x = 1,687.26 × 394.55
  4. Step 4: Simplify right side
    1,125.15x = 665,712.65
  5. Step 5: Solve for x
    x = 665,712.65/1,125.15
  6. Step 6: Final answer
    x = 591.67

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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.