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Finding the Fourth Proportional to 13,478, 18,599.64 and 7,889

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Solution

The fourth proportional to 13,478, 18,599.64 and 7,889 is: 10,886.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,478 : 18,599.64 = 7,889 : x
  2. Step 2: Convert to fraction form
    13,478/18,599.64 = 7,889/x
  3. Step 3: Cross multiply
    13,478x = 18,599.64 × 7,889
  4. Step 4: Simplify right side
    13,478x = 146,732,559.96
  5. Step 5: Solve for x
    x = 146,732,559.96/13,478
  6. Step 6: Final answer
    x = 10,886.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.