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Finding the Fourth Proportional to 738.56, 1,018.76 and 628.68

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Solution

The fourth proportional to 738.56, 1,018.76 and 628.68 is: 867.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.56 : 1,018.76 = 628.68 : x
  2. Step 2: Convert to fraction form
    738.56/1,018.76 = 628.68/x
  3. Step 3: Cross multiply
    738.56x = 1,018.76 × 628.68
  4. Step 4: Simplify right side
    738.56x = 640,474.04
  5. Step 5: Solve for x
    x = 640,474.04/738.56
  6. Step 6: Final answer
    x = 867.19

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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.