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Finding the Fourth Proportional to 831.36, 1,247.06 and 215.03

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Solution

The fourth proportional to 831.36, 1,247.06 and 215.03 is: 322.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.36 : 1,247.06 = 215.03 : x
  2. Step 2: Convert to fraction form
    831.36/1,247.06 = 215.03/x
  3. Step 3: Cross multiply
    831.36x = 1,247.06 × 215.03
  4. Step 4: Simplify right side
    831.36x = 268,150.74
  5. Step 5: Solve for x
    x = 268,150.74/831.36
  6. Step 6: Final answer
    x = 322.54

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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.