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Finding the Fourth Proportional to 13,313, 19,969.50 and 4,079

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Solution

The fourth proportional to 13,313, 19,969.50 and 4,079 is: 6,118.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,313 : 19,969.50 = 4,079 : x
  2. Step 2: Convert to fraction form
    13,313/19,969.50 = 4,079/x
  3. Step 3: Cross multiply
    13,313x = 19,969.50 × 4,079
  4. Step 4: Simplify right side
    13,313x = 81,455,590.50
  5. Step 5: Solve for x
    x = 81,455,590.50/13,313
  6. Step 6: Final answer
    x = 6,118.50

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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.