Home / 1,381.20-1,904.28-1,086

Finding the Fourth Proportional to 1,381.20, 1,904.28 and 1,086

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Solution

The fourth proportional to 1,381.20, 1,904.28 and 1,086 is: 1,497.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.20 : 1,904.28 = 1,086 : x
  2. Step 2: Convert to fraction form
    1,381.20/1,904.28 = 1,086/x
  3. Step 3: Cross multiply
    1,381.20x = 1,904.28 × 1,086
  4. Step 4: Simplify right side
    1,381.20x = 2,068,048.08
  5. Step 5: Solve for x
    x = 2,068,048.08/1,381.20
  6. Step 6: Final answer
    x = 1,497.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.