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Finding the Fourth Proportional to 13,107.88, 18,088.92 and 7,139.49

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Solution

The fourth proportional to 13,107.88, 18,088.92 and 7,139.49 is: 9,852.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,107.88 : 18,088.92 = 7,139.49 : x
  2. Step 2: Convert to fraction form
    13,107.88/18,088.92 = 7,139.49/x
  3. Step 3: Cross multiply
    13,107.88x = 18,088.92 × 7,139.49
  4. Step 4: Simplify right side
    13,107.88x = 129,145,697.37
  5. Step 5: Solve for x
    x = 129,145,697.37/13,107.88
  6. Step 6: Final answer
    x = 9,852.53

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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.