Home / 1,609.34-2,220.30-979.61

Finding the Fourth Proportional to 1,609.34, 2,220.30 and 979.61

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Solution

The fourth proportional to 1,609.34, 2,220.30 and 979.61 is: 1,351.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,609.34 : 2,220.30 = 979.61 : x
  2. Step 2: Convert to fraction form
    1,609.34/2,220.30 = 979.61/x
  3. Step 3: Cross multiply
    1,609.34x = 2,220.30 × 979.61
  4. Step 4: Simplify right side
    1,609.34x = 2,175,028.08
  5. Step 5: Solve for x
    x = 2,175,028.08/1,609.34
  6. Step 6: Final answer
    x = 1,351.50

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1.5x scale

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.