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Finding the Fourth Proportional to 479.21, 661.37 and 292.66

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Solution

The fourth proportional to 479.21, 661.37 and 292.66 is: 403.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.21 : 661.37 = 292.66 : x
  2. Step 2: Convert to fraction form
    479.21/661.37 = 292.66/x
  3. Step 3: Cross multiply
    479.21x = 661.37 × 292.66
  4. Step 4: Simplify right side
    479.21x = 193,552.50
  5. Step 5: Solve for x
    x = 193,552.50/479.21
  6. Step 6: Final answer
    x = 403.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.