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Finding the Fourth Proportional to 679.89, 938.78 and 443.91

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Solution

The fourth proportional to 679.89, 938.78 and 443.91 is: 612.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.89 : 938.78 = 443.91 : x
  2. Step 2: Convert to fraction form
    679.89/938.78 = 443.91/x
  3. Step 3: Cross multiply
    679.89x = 938.78 × 443.91
  4. Step 4: Simplify right side
    679.89x = 416,731.61
  5. Step 5: Solve for x
    x = 416,731.61/679.89
  6. Step 6: Final answer
    x = 612.94

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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.