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Finding the Fourth Proportional to 3,115.86, 4,673.79 and 775.86

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Solution

The fourth proportional to 3,115.86, 4,673.79 and 775.86 is: 1,163.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,115.86 : 4,673.79 = 775.86 : x
  2. Step 2: Convert to fraction form
    3,115.86/4,673.79 = 775.86/x
  3. Step 3: Cross multiply
    3,115.86x = 4,673.79 × 775.86
  4. Step 4: Simplify right side
    3,115.86x = 3,626,206.71
  5. Step 5: Solve for x
    x = 3,626,206.71/3,115.86
  6. Step 6: Final answer
    x = 1,163.79

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1.5x scale

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.