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Finding the Fourth Proportional to 722.38, 1,003.79 and 713.20

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Solution

The fourth proportional to 722.38, 1,003.79 and 713.20 is: 991.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.38 : 1,003.79 = 713.20 : x
  2. Step 2: Convert to fraction form
    722.38/1,003.79 = 713.20/x
  3. Step 3: Cross multiply
    722.38x = 1,003.79 × 713.20
  4. Step 4: Simplify right side
    722.38x = 715,903.03
  5. Step 5: Solve for x
    x = 715,903.03/722.38
  6. Step 6: Final answer
    x = 991.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.