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Finding the Fourth Proportional to 15,498.54, 21,388.86 and 8,424.81

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Solution

The fourth proportional to 15,498.54, 21,388.86 and 8,424.81 is: 11,626.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,498.54 : 21,388.86 = 8,424.81 : x
  2. Step 2: Convert to fraction form
    15,498.54/21,388.86 = 8,424.81/x
  3. Step 3: Cross multiply
    15,498.54x = 21,388.86 × 8,424.81
  4. Step 4: Simplify right side
    15,498.54x = 180,197,081.62
  5. Step 5: Solve for x
    x = 180,197,081.62/15,498.54
  6. Step 6: Final answer
    x = 11,626.71

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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.