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Finding the Fourth Proportional to 1,909.70, 2,864.54 and 611.14

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Solution

The fourth proportional to 1,909.70, 2,864.54 and 611.14 is: 916.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,909.70 : 2,864.54 = 611.14 : x
  2. Step 2: Convert to fraction form
    1,909.70/2,864.54 = 611.14/x
  3. Step 3: Cross multiply
    1,909.70x = 2,864.54 × 611.14
  4. Step 4: Simplify right side
    1,909.70x = 1,750,634.98
  5. Step 5: Solve for x
    x = 1,750,634.98/1,909.70
  6. Step 6: Final answer
    x = 916.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.