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Finding the Fourth Proportional to 1,479.45, 2,219.16 and 613.78

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Solution

The fourth proportional to 1,479.45, 2,219.16 and 613.78 is: 920.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,479.45 : 2,219.16 = 613.78 : x
  2. Step 2: Convert to fraction form
    1,479.45/2,219.16 = 613.78/x
  3. Step 3: Cross multiply
    1,479.45x = 2,219.16 × 613.78
  4. Step 4: Simplify right side
    1,479.45x = 1,362,076.02
  5. Step 5: Solve for x
    x = 1,362,076.02/1,479.45
  6. Step 6: Final answer
    x = 920.66

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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.