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Finding the Fourth Proportional to 13,919.31, 20,880.81 and 7,345.98

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Solution

The fourth proportional to 13,919.31, 20,880.81 and 7,345.98 is: 11,019.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,919.31 : 20,880.81 = 7,345.98 : x
  2. Step 2: Convert to fraction form
    13,919.31/20,880.81 = 7,345.98/x
  3. Step 3: Cross multiply
    13,919.31x = 20,880.81 × 7,345.98
  4. Step 4: Simplify right side
    13,919.31x = 153,390,012.64
  5. Step 5: Solve for x
    x = 153,390,012.64/13,919.31
  6. Step 6: Final answer
    x = 11,019.94

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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.