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Finding the Fourth Proportional to 1,319.37, 1,978.32 and 831.39

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Solution

The fourth proportional to 1,319.37, 1,978.32 and 831.39 is: 1,246.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.37 : 1,978.32 = 831.39 : x
  2. Step 2: Convert to fraction form
    1,319.37/1,978.32 = 831.39/x
  3. Step 3: Cross multiply
    1,319.37x = 1,978.32 × 831.39
  4. Step 4: Simplify right side
    1,319.37x = 1,644,755.46
  5. Step 5: Solve for x
    x = 1,644,755.46/1,319.37
  6. Step 6: Final answer
    x = 1,246.62

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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.