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Finding the Fourth Proportional to 1,626.61, 2,243.21 and 1,221.21

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Solution

The fourth proportional to 1,626.61, 2,243.21 and 1,221.21 is: 1,684.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,626.61 : 2,243.21 = 1,221.21 : x
  2. Step 2: Convert to fraction form
    1,626.61/2,243.21 = 1,221.21/x
  3. Step 3: Cross multiply
    1,626.61x = 2,243.21 × 1,221.21
  4. Step 4: Simplify right side
    1,626.61x = 2,739,430.48
  5. Step 5: Solve for x
    x = 2,739,430.48/1,626.61
  6. Step 6: Final answer
    x = 1,684.13

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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.