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Finding the Fourth Proportional to 1,909.39, 2,631.39 and 1,489.08

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Solution

The fourth proportional to 1,909.39, 2,631.39 and 1,489.08 is: 2,052.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,909.39 : 2,631.39 = 1,489.08 : x
  2. Step 2: Convert to fraction form
    1,909.39/2,631.39 = 1,489.08/x
  3. Step 3: Cross multiply
    1,909.39x = 2,631.39 × 1,489.08
  4. Step 4: Simplify right side
    1,909.39x = 3,918,333.34
  5. Step 5: Solve for x
    x = 3,918,333.34/1,909.39
  6. Step 6: Final answer
    x = 2,052.14

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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.