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Finding the Fourth Proportional to 831.06, 1,246.71 and 781.62

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Solution

The fourth proportional to 831.06, 1,246.71 and 781.62 is: 1,172.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.06 : 1,246.71 = 781.62 : x
  2. Step 2: Convert to fraction form
    831.06/1,246.71 = 781.62/x
  3. Step 3: Cross multiply
    831.06x = 1,246.71 × 781.62
  4. Step 4: Simplify right side
    831.06x = 974,453.47
  5. Step 5: Solve for x
    x = 974,453.47/831.06
  6. Step 6: Final answer
    x = 1,172.54

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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.