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Finding the Fourth Proportional to 2,758.86, 4,138.98 and 811.08

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Solution

The fourth proportional to 2,758.86, 4,138.98 and 811.08 is: 1,216.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,758.86 : 4,138.98 = 811.08 : x
  2. Step 2: Convert to fraction form
    2,758.86/4,138.98 = 811.08/x
  3. Step 3: Cross multiply
    2,758.86x = 4,138.98 × 811.08
  4. Step 4: Simplify right side
    2,758.86x = 3,357,045.42
  5. Step 5: Solve for x
    x = 3,357,045.42/2,758.86
  6. Step 6: Final answer
    x = 1,216.82

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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.