Home / 1,615.62-2,420.79-1,129.21

Finding the Fourth Proportional to 1,615.62, 2,420.79 and 1,129.21

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Solution

The fourth proportional to 1,615.62, 2,420.79 and 1,129.21 is: 1,691.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.62 : 2,420.79 = 1,129.21 : x
  2. Step 2: Convert to fraction form
    1,615.62/2,420.79 = 1,129.21/x
  3. Step 3: Cross multiply
    1,615.62x = 2,420.79 × 1,129.21
  4. Step 4: Simplify right side
    1,615.62x = 2,733,580.28
  5. Step 5: Solve for x
    x = 2,733,580.28/1,615.62
  6. Step 6: Final answer
    x = 1,691.97

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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.