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Finding the Fourth Proportional to 831.81, 1,147.94 and 551.55

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Solution

The fourth proportional to 831.81, 1,147.94 and 551.55 is: 761.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.81 : 1,147.94 = 551.55 : x
  2. Step 2: Convert to fraction form
    831.81/1,147.94 = 551.55/x
  3. Step 3: Cross multiply
    831.81x = 1,147.94 × 551.55
  4. Step 4: Simplify right side
    831.81x = 633,146.31
  5. Step 5: Solve for x
    x = 633,146.31/831.81
  6. Step 6: Final answer
    x = 761.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.