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Finding the Fourth Proportional to 1,609.81, 2,220.11 and 1,086.55

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Solution

The fourth proportional to 1,609.81, 2,220.11 and 1,086.55 is: 1,498.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,609.81 : 2,220.11 = 1,086.55 : x
  2. Step 2: Convert to fraction form
    1,609.81/2,220.11 = 1,086.55/x
  3. Step 3: Cross multiply
    1,609.81x = 2,220.11 × 1,086.55
  4. Step 4: Simplify right side
    1,609.81x = 2,412,253.61
  5. Step 5: Solve for x
    x = 2,412,253.61/1,609.81
  6. Step 6: Final answer
    x = 1,498.47

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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.