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Finding the Fourth Proportional to 831.72, 1,247.19 and 442.18

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Solution

The fourth proportional to 831.72, 1,247.19 and 442.18 is: 663.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.72 : 1,247.19 = 442.18 : x
  2. Step 2: Convert to fraction form
    831.72/1,247.19 = 442.18/x
  3. Step 3: Cross multiply
    831.72x = 1,247.19 × 442.18
  4. Step 4: Simplify right side
    831.72x = 551,479.36
  5. Step 5: Solve for x
    x = 551,479.36/831.72
  6. Step 6: Final answer
    x = 663.06

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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.