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Finding the Fourth Proportional to 1,909.72, 2,864.79 and 677.11

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Solution

The fourth proportional to 1,909.72, 2,864.79 and 677.11 is: 1,015.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,909.72 : 2,864.79 = 677.11 : x
  2. Step 2: Convert to fraction form
    1,909.72/2,864.79 = 677.11/x
  3. Step 3: Cross multiply
    1,909.72x = 2,864.79 × 677.11
  4. Step 4: Simplify right side
    1,909.72x = 1,939,777.96
  5. Step 5: Solve for x
    x = 1,939,777.96/1,909.72
  6. Step 6: Final answer
    x = 1,015.74

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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.