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Finding the Fourth Proportional to 12,990.93, 17,927.54 and 8,212.97

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Solution

The fourth proportional to 12,990.93, 17,927.54 and 8,212.97 is: 11,333.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990.93 : 17,927.54 = 8,212.97 : x
  2. Step 2: Convert to fraction form
    12,990.93/17,927.54 = 8,212.97/x
  3. Step 3: Cross multiply
    12,990.93x = 17,927.54 × 8,212.97
  4. Step 4: Simplify right side
    12,990.93x = 147,238,343.87
  5. Step 5: Solve for x
    x = 147,238,343.87/12,990.93
  6. Step 6: Final answer
    x = 11,333.93

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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.