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Finding the Fourth Proportional to 1,479.12, 2,217.78 and 613.32

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Solution

The fourth proportional to 1,479.12, 2,217.78 and 613.32 is: 919.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,479.12 : 2,217.78 = 613.32 : x
  2. Step 2: Convert to fraction form
    1,479.12/2,217.78 = 613.32/x
  3. Step 3: Cross multiply
    1,479.12x = 2,217.78 × 613.32
  4. Step 4: Simplify right side
    1,479.12x = 1,360,208.83
  5. Step 5: Solve for x
    x = 1,360,208.83/1,479.12
  6. Step 6: Final answer
    x = 919.61

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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.