Home / 1,081.50-1,621.39-432.06

Finding the Fourth Proportional to 1,081.50, 1,621.39 and 432.06

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Solution

The fourth proportional to 1,081.50, 1,621.39 and 432.06 is: 647.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.50 : 1,621.39 = 432.06 : x
  2. Step 2: Convert to fraction form
    1,081.50/1,621.39 = 432.06/x
  3. Step 3: Cross multiply
    1,081.50x = 1,621.39 × 432.06
  4. Step 4: Simplify right side
    1,081.50x = 700,537.76
  5. Step 5: Solve for x
    x = 700,537.76/1,081.50
  6. Step 6: Final answer
    x = 647.75

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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.