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Finding the Fourth Proportional to 429.86, 644.68 and 121.74

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Solution

The fourth proportional to 429.86, 644.68 and 121.74 is: 182.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.86 : 644.68 = 121.74 : x
  2. Step 2: Convert to fraction form
    429.86/644.68 = 121.74/x
  3. Step 3: Cross multiply
    429.86x = 644.68 × 121.74
  4. Step 4: Simplify right side
    429.86x = 78,483.34
  5. Step 5: Solve for x
    x = 78,483.34/429.86
  6. Step 6: Final answer
    x = 182.58

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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.