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Finding the Fourth Proportional to 939.50, 1,297.74 and 721.15

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Solution

The fourth proportional to 939.50, 1,297.74 and 721.15 is: 996.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.50 : 1,297.74 = 721.15 : x
  2. Step 2: Convert to fraction form
    939.50/1,297.74 = 721.15/x
  3. Step 3: Cross multiply
    939.50x = 1,297.74 × 721.15
  4. Step 4: Simplify right side
    939.50x = 935,864.66
  5. Step 5: Solve for x
    x = 935,864.66/939.50
  6. Step 6: Final answer
    x = 996.13

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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.