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Finding the Fourth Proportional to 831.52, 1,247.05 and 541.05

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Solution

The fourth proportional to 831.52, 1,247.05 and 541.05 is: 811.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.52 : 1,247.05 = 541.05 : x
  2. Step 2: Convert to fraction form
    831.52/1,247.05 = 541.05/x
  3. Step 3: Cross multiply
    831.52x = 1,247.05 × 541.05
  4. Step 4: Simplify right side
    831.52x = 674,719.88
  5. Step 5: Solve for x
    x = 674,719.88/831.52
  6. Step 6: Final answer
    x = 811.43

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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.