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Finding the Fourth Proportional to 738.17, 1,018.13 and 644.71

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Solution

The fourth proportional to 738.17, 1,018.13 and 644.71 is: 889.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.17 : 1,018.13 = 644.71 : x
  2. Step 2: Convert to fraction form
    738.17/1,018.13 = 644.71/x
  3. Step 3: Cross multiply
    738.17x = 1,018.13 × 644.71
  4. Step 4: Simplify right side
    738.17x = 656,396.64
  5. Step 5: Solve for x
    x = 656,396.64/738.17
  6. Step 6: Final answer
    x = 889.23

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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.