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Finding the Fourth Proportional to 831.63, 1,247.60 and 312

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Solution

The fourth proportional to 831.63, 1,247.60 and 312 is: 468.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.63 : 1,247.60 = 312 : x
  2. Step 2: Convert to fraction form
    831.63/1,247.60 = 312/x
  3. Step 3: Cross multiply
    831.63x = 1,247.60 × 312
  4. Step 4: Simplify right side
    831.63x = 389,251.20
  5. Step 5: Solve for x
    x = 389,251.20/831.63
  6. Step 6: Final answer
    x = 468.06

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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.