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Finding the Fourth Proportional to 15,699.84, 21,665.79 and 8,626.79

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Solution

The fourth proportional to 15,699.84, 21,665.79 and 8,626.79 is: 11,904.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,699.84 : 21,665.79 = 8,626.79 : x
  2. Step 2: Convert to fraction form
    15,699.84/21,665.79 = 8,626.79/x
  3. Step 3: Cross multiply
    15,699.84x = 21,665.79 × 8,626.79
  4. Step 4: Simplify right side
    15,699.84x = 186,906,112.19
  5. Step 5: Solve for x
    x = 186,906,112.19/15,699.84
  6. Step 6: Final answer
    x = 11,904.97

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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.