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Finding the Fourth Proportional to 831.02, 1,147.26 and 720.22

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Solution

The fourth proportional to 831.02, 1,147.26 and 720.22 is: 994.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.02 : 1,147.26 = 720.22 : x
  2. Step 2: Convert to fraction form
    831.02/1,147.26 = 720.22/x
  3. Step 3: Cross multiply
    831.02x = 1,147.26 × 720.22
  4. Step 4: Simplify right side
    831.02x = 826,279.60
  5. Step 5: Solve for x
    x = 826,279.60/831.02
  6. Step 6: Final answer
    x = 994.30

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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.