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Finding the Fourth Proportional to 1,909.68, 2,864.79 and 611.34

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Solution

The fourth proportional to 1,909.68, 2,864.79 and 611.34 is: 917.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,909.68 : 2,864.79 = 611.34 : x
  2. Step 2: Convert to fraction form
    1,909.68/2,864.79 = 611.34/x
  3. Step 3: Cross multiply
    1,909.68x = 2,864.79 × 611.34
  4. Step 4: Simplify right side
    1,909.68x = 1,751,360.72
  5. Step 5: Solve for x
    x = 1,751,360.72/1,909.68
  6. Step 6: Final answer
    x = 917.10

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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.