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Finding the Fourth Proportional to 12,490.28, 17,238.99 and 8,019.69

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Solution

The fourth proportional to 12,490.28, 17,238.99 and 8,019.69 is: 11,068.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,490.28 : 17,238.99 = 8,019.69 : x
  2. Step 2: Convert to fraction form
    12,490.28/17,238.99 = 8,019.69/x
  3. Step 3: Cross multiply
    12,490.28x = 17,238.99 × 8,019.69
  4. Step 4: Simplify right side
    12,490.28x = 138,251,355.71
  5. Step 5: Solve for x
    x = 138,251,355.71/12,490.28
  6. Step 6: Final answer
    x = 11,068.72

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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.