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Finding the Fourth Proportional to 440.22, 659.90 and 286.20

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Solution

The fourth proportional to 440.22, 659.90 and 286.20 is: 429.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.22 : 659.90 = 286.20 : x
  2. Step 2: Convert to fraction form
    440.22/659.90 = 286.20/x
  3. Step 3: Cross multiply
    440.22x = 659.90 × 286.20
  4. Step 4: Simplify right side
    440.22x = 188,863.38
  5. Step 5: Solve for x
    x = 188,863.38/440.22
  6. Step 6: Final answer
    x = 429.02

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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.