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Finding the Fourth Proportional to 403.86, 557.31 and 229.22

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Solution

The fourth proportional to 403.86, 557.31 and 229.22 is: 316.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.86 : 557.31 = 229.22 : x
  2. Step 2: Convert to fraction form
    403.86/557.31 = 229.22/x
  3. Step 3: Cross multiply
    403.86x = 557.31 × 229.22
  4. Step 4: Simplify right side
    403.86x = 127,746.60
  5. Step 5: Solve for x
    x = 127,746.60/403.86
  6. Step 6: Final answer
    x = 316.31

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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.