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Finding the Fourth Proportional to 738.12, 1,018.62 and 443.80

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Solution

The fourth proportional to 738.12, 1,018.62 and 443.80 is: 612.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.12 : 1,018.62 = 443.80 : x
  2. Step 2: Convert to fraction form
    738.12/1,018.62 = 443.80/x
  3. Step 3: Cross multiply
    738.12x = 1,018.62 × 443.80
  4. Step 4: Simplify right side
    738.12x = 452,063.56
  5. Step 5: Solve for x
    x = 452,063.56/738.12
  6. Step 6: Final answer
    x = 612.45

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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.