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Finding the Fourth Proportional to 831.93, 1,247.91 and 345.03

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Solution

The fourth proportional to 831.93, 1,247.91 and 345.03 is: 517.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.93 : 1,247.91 = 345.03 : x
  2. Step 2: Convert to fraction form
    831.93/1,247.91 = 345.03/x
  3. Step 3: Cross multiply
    831.93x = 1,247.91 × 345.03
  4. Step 4: Simplify right side
    831.93x = 430,566.39
  5. Step 5: Solve for x
    x = 430,566.39/831.93
  6. Step 6: Final answer
    x = 517.55

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.