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Finding the Fourth Proportional to 13,398.91, 18,479.82 and 8,619.40

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Solution

The fourth proportional to 13,398.91, 18,479.82 and 8,619.40 is: 11,887.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,398.91 : 18,479.82 = 8,619.40 : x
  2. Step 2: Convert to fraction form
    13,398.91/18,479.82 = 8,619.40/x
  3. Step 3: Cross multiply
    13,398.91x = 18,479.82 × 8,619.40
  4. Step 4: Simplify right side
    13,398.91x = 159,285,015.93
  5. Step 5: Solve for x
    x = 159,285,015.93/13,398.91
  6. Step 6: Final answer
    x = 11,887.91

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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.