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Finding the Fourth Proportional to 831.97, 1,145.44 and 644.56

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Solution

The fourth proportional to 831.97, 1,145.44 and 644.56 is: 887.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.97 : 1,145.44 = 644.56 : x
  2. Step 2: Convert to fraction form
    831.97/1,145.44 = 644.56/x
  3. Step 3: Cross multiply
    831.97x = 1,145.44 × 644.56
  4. Step 4: Simplify right side
    831.97x = 738,302.75
  5. Step 5: Solve for x
    x = 738,302.75/831.97
  6. Step 6: Final answer
    x = 887.41

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1.5x scale

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.