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Finding the Fourth Proportional to 429.53, 644.34 and 117.18

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Solution

The fourth proportional to 429.53, 644.34 and 117.18 is: 175.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.53 : 644.34 = 117.18 : x
  2. Step 2: Convert to fraction form
    429.53/644.34 = 117.18/x
  3. Step 3: Cross multiply
    429.53x = 644.34 × 117.18
  4. Step 4: Simplify right side
    429.53x = 75,503.32
  5. Step 5: Solve for x
    x = 75,503.32/429.53
  6. Step 6: Final answer
    x = 175.78

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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.