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Finding the Fourth Proportional to 738.72, 1,107.42 and 305.60

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Solution

The fourth proportional to 738.72, 1,107.42 and 305.60 is: 458.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.72 : 1,107.42 = 305.60 : x
  2. Step 2: Convert to fraction form
    738.72/1,107.42 = 305.60/x
  3. Step 3: Cross multiply
    738.72x = 1,107.42 × 305.60
  4. Step 4: Simplify right side
    738.72x = 338,427.55
  5. Step 5: Solve for x
    x = 338,427.55/738.72
  6. Step 6: Final answer
    x = 458.13

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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.