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Finding the Fourth Proportional to 1,609.70, 2,221.47 and 980.13

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Solution

The fourth proportional to 1,609.70, 2,221.47 and 980.13 is: 1,352.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,609.70 : 2,221.47 = 980.13 : x
  2. Step 2: Convert to fraction form
    1,609.70/2,221.47 = 980.13/x
  3. Step 3: Cross multiply
    1,609.70x = 2,221.47 × 980.13
  4. Step 4: Simplify right side
    1,609.70x = 2,177,329.39
  5. Step 5: Solve for x
    x = 2,177,329.39/1,609.70
  6. Step 6: Final answer
    x = 1,352.63

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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.