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Finding the Fourth Proportional to 831.42, 1,245.81 and 571.53

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Solution

The fourth proportional to 831.42, 1,245.81 and 571.53 is: 856.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.42 : 1,245.81 = 571.53 : x
  2. Step 2: Convert to fraction form
    831.42/1,245.81 = 571.53/x
  3. Step 3: Cross multiply
    831.42x = 1,245.81 × 571.53
  4. Step 4: Simplify right side
    831.42x = 712,017.79
  5. Step 5: Solve for x
    x = 712,017.79/831.42
  6. Step 6: Final answer
    x = 856.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.