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Finding the Fourth Proportional to 13,859.88, 19,128.18 and 7,890.60

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Solution

The fourth proportional to 13,859.88, 19,128.18 and 7,890.60 is: 10,889.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,859.88 : 19,128.18 = 7,890.60 : x
  2. Step 2: Convert to fraction form
    13,859.88/19,128.18 = 7,890.60/x
  3. Step 3: Cross multiply
    13,859.88x = 19,128.18 × 7,890.60
  4. Step 4: Simplify right side
    13,859.88x = 150,932,817.11
  5. Step 5: Solve for x
    x = 150,932,817.11/13,859.88
  6. Step 6: Final answer
    x = 10,889.91

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1.5x scale

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.