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Finding the Fourth Proportional to 412.64, 619.32 and 220.40

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Solution

The fourth proportional to 412.64, 619.32 and 220.40 is: 330.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.64 : 619.32 = 220.40 : x
  2. Step 2: Convert to fraction form
    412.64/619.32 = 220.40/x
  3. Step 3: Cross multiply
    412.64x = 619.32 × 220.40
  4. Step 4: Simplify right side
    412.64x = 136,498.13
  5. Step 5: Solve for x
    x = 136,498.13/412.64
  6. Step 6: Final answer
    x = 330.79

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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.