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Finding the Fourth Proportional to 738.23, 1,107.87 and 429.67

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Solution

The fourth proportional to 738.23, 1,107.87 and 429.67 is: 644.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.23 : 1,107.87 = 429.67 : x
  2. Step 2: Convert to fraction form
    738.23/1,107.87 = 429.67/x
  3. Step 3: Cross multiply
    738.23x = 1,107.87 × 429.67
  4. Step 4: Simplify right side
    738.23x = 476,018.50
  5. Step 5: Solve for x
    x = 476,018.50/738.23
  6. Step 6: Final answer
    x = 644.81

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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.