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Finding the Fourth Proportional to 691.96, 955.12 and 443.94

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Solution

The fourth proportional to 691.96, 955.12 and 443.94 is: 612.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.96 : 955.12 = 443.94 : x
  2. Step 2: Convert to fraction form
    691.96/955.12 = 443.94/x
  3. Step 3: Cross multiply
    691.96x = 955.12 × 443.94
  4. Step 4: Simplify right side
    691.96x = 424,015.97
  5. Step 5: Solve for x
    x = 424,015.97/691.96
  6. Step 6: Final answer
    x = 612.78

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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.