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Finding the Fourth Proportional to 738.70, 1,018.99 and 443.80

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Solution

The fourth proportional to 738.70, 1,018.99 and 443.80 is: 612.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.70 : 1,018.99 = 443.80 : x
  2. Step 2: Convert to fraction form
    738.70/1,018.99 = 443.80/x
  3. Step 3: Cross multiply
    738.70x = 1,018.99 × 443.80
  4. Step 4: Simplify right side
    738.70x = 452,227.76
  5. Step 5: Solve for x
    x = 452,227.76/738.70
  6. Step 6: Final answer
    x = 612.19

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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.