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Finding the Fourth Proportional to 853.16, 1,278.59 and 831.56

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Solution

The fourth proportional to 853.16, 1,278.59 and 831.56 is: 1,246.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.16 : 1,278.59 = 831.56 : x
  2. Step 2: Convert to fraction form
    853.16/1,278.59 = 831.56/x
  3. Step 3: Cross multiply
    853.16x = 1,278.59 × 831.56
  4. Step 4: Simplify right side
    853.16x = 1,063,213.75
  5. Step 5: Solve for x
    x = 1,063,213.75/853.16
  6. Step 6: Final answer
    x = 1,246.21

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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.