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Finding the Fourth Proportional to 738.05, 1,018.29 and 443.21

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Solution

The fourth proportional to 738.05, 1,018.29 and 443.21 is: 611.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.05 : 1,018.29 = 443.21 : x
  2. Step 2: Convert to fraction form
    738.05/1,018.29 = 443.21/x
  3. Step 3: Cross multiply
    738.05x = 1,018.29 × 443.21
  4. Step 4: Simplify right side
    738.05x = 451,316.31
  5. Step 5: Solve for x
    x = 451,316.31/738.05
  6. Step 6: Final answer
    x = 611.50

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Double scale
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1.5x scale

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.