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Finding the Fourth Proportional to 738.09, 1,018.71 and 439.41

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Solution

The fourth proportional to 738.09, 1,018.71 and 439.41 is: 606.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.09 : 1,018.71 = 439.41 : x
  2. Step 2: Convert to fraction form
    738.09/1,018.71 = 439.41/x
  3. Step 3: Cross multiply
    738.09x = 1,018.71 × 439.41
  4. Step 4: Simplify right side
    738.09x = 447,631.36
  5. Step 5: Solve for x
    x = 447,631.36/738.09
  6. Step 6: Final answer
    x = 606.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.