Home / 1,081.32-1,621.40-423.42

Finding the Fourth Proportional to 1,081.32, 1,621.40 and 423.42

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Solution

The fourth proportional to 1,081.32, 1,621.40 and 423.42 is: 634.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.32 : 1,621.40 = 423.42 : x
  2. Step 2: Convert to fraction form
    1,081.32/1,621.40 = 423.42/x
  3. Step 3: Cross multiply
    1,081.32x = 1,621.40 × 423.42
  4. Step 4: Simplify right side
    1,081.32x = 686,531.07
  5. Step 5: Solve for x
    x = 686,531.07/1,081.32
  6. Step 6: Final answer
    x = 634.90

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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.