Home / 1,311.85-1,967.19-387.08

Finding the Fourth Proportional to 1,311.85, 1,967.19 and 387.08

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Solution

The fourth proportional to 1,311.85, 1,967.19 and 387.08 is: 580.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.85 : 1,967.19 = 387.08 : x
  2. Step 2: Convert to fraction form
    1,311.85/1,967.19 = 387.08/x
  3. Step 3: Cross multiply
    1,311.85x = 1,967.19 × 387.08
  4. Step 4: Simplify right side
    1,311.85x = 761,464.29
  5. Step 5: Solve for x
    x = 761,464.29/1,311.85
  6. Step 6: Final answer
    x = 580.45

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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.