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Finding the Fourth Proportional to 12,615.80, 18,910.20 and 4,288.10

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Solution

The fourth proportional to 12,615.80, 18,910.20 and 4,288.10 is: 6,427.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,615.80 : 18,910.20 = 4,288.10 : x
  2. Step 2: Convert to fraction form
    12,615.80/18,910.20 = 4,288.10/x
  3. Step 3: Cross multiply
    12,615.80x = 18,910.20 × 4,288.10
  4. Step 4: Simplify right side
    12,615.80x = 81,088,828.62
  5. Step 5: Solve for x
    x = 81,088,828.62/12,615.80
  6. Step 6: Final answer
    x = 6,427.56

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1.5x scale

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.