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Finding the Fourth Proportional to 1,909.94, 2,864.77 and 611.51

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Solution

The fourth proportional to 1,909.94, 2,864.77 and 611.51 is: 917.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,909.94 : 2,864.77 = 611.51 : x
  2. Step 2: Convert to fraction form
    1,909.94/2,864.77 = 611.51/x
  3. Step 3: Cross multiply
    1,909.94x = 2,864.77 × 611.51
  4. Step 4: Simplify right side
    1,909.94x = 1,751,819.65
  5. Step 5: Solve for x
    x = 1,751,819.65/1,909.94
  6. Step 6: Final answer
    x = 917.21

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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.