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Finding the Fourth Proportional to 738.72, 1,107.47 and 429.81

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Solution

The fourth proportional to 738.72, 1,107.47 and 429.81 is: 644.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.72 : 1,107.47 = 429.81 : x
  2. Step 2: Convert to fraction form
    738.72/1,107.47 = 429.81/x
  3. Step 3: Cross multiply
    738.72x = 1,107.47 × 429.81
  4. Step 4: Simplify right side
    738.72x = 475,998.60
  5. Step 5: Solve for x
    x = 475,998.60/738.72
  6. Step 6: Final answer
    x = 644.36

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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.