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Finding the Fourth Proportional to 891.42, 1,343.82 and 831.96

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Solution

The fourth proportional to 891.42, 1,343.82 and 831.96 is: 1,254.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.42 : 1,343.82 = 831.96 : x
  2. Step 2: Convert to fraction form
    891.42/1,343.82 = 831.96/x
  3. Step 3: Cross multiply
    891.42x = 1,343.82 × 831.96
  4. Step 4: Simplify right side
    891.42x = 1,118,004.49
  5. Step 5: Solve for x
    x = 1,118,004.49/891.42
  6. Step 6: Final answer
    x = 1,254.18

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.