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Finding the Fourth Proportional to 831.51, 1,147.66 and 551.76

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Solution

The fourth proportional to 831.51, 1,147.66 and 551.76 is: 761.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.51 : 1,147.66 = 551.76 : x
  2. Step 2: Convert to fraction form
    831.51/1,147.66 = 551.76/x
  3. Step 3: Cross multiply
    831.51x = 1,147.66 × 551.76
  4. Step 4: Simplify right side
    831.51x = 633,230.12
  5. Step 5: Solve for x
    x = 633,230.12/831.51
  6. Step 6: Final answer
    x = 761.54

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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.