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Finding the Fourth Proportional to 429.78, 644.49 and 237.18

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Solution

The fourth proportional to 429.78, 644.49 and 237.18 is: 355.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.78 : 644.49 = 237.18 : x
  2. Step 2: Convert to fraction form
    429.78/644.49 = 237.18/x
  3. Step 3: Cross multiply
    429.78x = 644.49 × 237.18
  4. Step 4: Simplify right side
    429.78x = 152,860.14
  5. Step 5: Solve for x
    x = 152,860.14/429.78
  6. Step 6: Final answer
    x = 355.67

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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.