Home / 1,081.52-1,621.40-431.62

Finding the Fourth Proportional to 1,081.52, 1,621.40 and 431.62

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Solution

The fourth proportional to 1,081.52, 1,621.40 and 431.62 is: 647.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.52 : 1,621.40 = 431.62 : x
  2. Step 2: Convert to fraction form
    1,081.52/1,621.40 = 431.62/x
  3. Step 3: Cross multiply
    1,081.52x = 1,621.40 × 431.62
  4. Step 4: Simplify right side
    1,081.52x = 699,828.67
  5. Step 5: Solve for x
    x = 699,828.67/1,081.52
  6. Step 6: Final answer
    x = 647.08

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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.