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Finding the Fourth Proportional to 964.69, 1,330.81 and 831.68

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Solution

The fourth proportional to 964.69, 1,330.81 and 831.68 is: 1,147.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.69 : 1,330.81 = 831.68 : x
  2. Step 2: Convert to fraction form
    964.69/1,330.81 = 831.68/x
  3. Step 3: Cross multiply
    964.69x = 1,330.81 × 831.68
  4. Step 4: Simplify right side
    964.69x = 1,106,808.06
  5. Step 5: Solve for x
    x = 1,106,808.06/964.69
  6. Step 6: Final answer
    x = 1,147.32

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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.