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Finding the Fourth Proportional to 439.86, 659.78 and 357.49

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Solution

The fourth proportional to 439.86, 659.78 and 357.49 is: 536.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.86 : 659.78 = 357.49 : x
  2. Step 2: Convert to fraction form
    439.86/659.78 = 357.49/x
  3. Step 3: Cross multiply
    439.86x = 659.78 × 357.49
  4. Step 4: Simplify right side
    439.86x = 235,867.03
  5. Step 5: Solve for x
    x = 235,867.03/439.86
  6. Step 6: Final answer
    x = 536.24

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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.