Home / 1,311.82-1,967.50-387.35

Finding the Fourth Proportional to 1,311.82, 1,967.50 and 387.35

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Solution

The fourth proportional to 1,311.82, 1,967.50 and 387.35 is: 580.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.82 : 1,967.50 = 387.35 : x
  2. Step 2: Convert to fraction form
    1,311.82/1,967.50 = 387.35/x
  3. Step 3: Cross multiply
    1,311.82x = 1,967.50 × 387.35
  4. Step 4: Simplify right side
    1,311.82x = 762,111.13
  5. Step 5: Solve for x
    x = 762,111.13/1,311.82
  6. Step 6: Final answer
    x = 580.96

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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.