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Finding the Fourth Proportional to 13,107.88, 18,089.09 and 7,139.55

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Solution

The fourth proportional to 13,107.88, 18,089.09 and 7,139.55 is: 9,852.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,107.88 : 18,089.09 = 7,139.55 : x
  2. Step 2: Convert to fraction form
    13,107.88/18,089.09 = 7,139.55/x
  3. Step 3: Cross multiply
    13,107.88x = 18,089.09 × 7,139.55
  4. Step 4: Simplify right side
    13,107.88x = 129,148,021.42
  5. Step 5: Solve for x
    x = 129,148,021.42/13,107.88
  6. Step 6: Final answer
    x = 9,852.70

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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.