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Finding the Fourth Proportional to 831.33, 1,147.29 and 551.09

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Solution

The fourth proportional to 831.33, 1,147.29 and 551.09 is: 760.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.33 : 1,147.29 = 551.09 : x
  2. Step 2: Convert to fraction form
    831.33/1,147.29 = 551.09/x
  3. Step 3: Cross multiply
    831.33x = 1,147.29 × 551.09
  4. Step 4: Simplify right side
    831.33x = 632,254.31
  5. Step 5: Solve for x
    x = 632,254.31/831.33
  6. Step 6: Final answer
    x = 760.53

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Double scale
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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.