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Finding the Fourth Proportional to 13,219, 19,831.80 and 3,985

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Solution

The fourth proportional to 13,219, 19,831.80 and 3,985 is: 5,978.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,219 : 19,831.80 = 3,985 : x
  2. Step 2: Convert to fraction form
    13,219/19,831.80 = 3,985/x
  3. Step 3: Cross multiply
    13,219x = 19,831.80 × 3,985
  4. Step 4: Simplify right side
    13,219x = 79,029,723
  5. Step 5: Solve for x
    x = 79,029,723/13,219
  6. Step 6: Final answer
    x = 5,978.49

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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.