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Finding the Fourth Proportional to 21,959.78, 30,304.56 and 11,888.34

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Solution

The fourth proportional to 21,959.78, 30,304.56 and 11,888.34 is: 16,405.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,959.78 : 30,304.56 = 11,888.34 : x
  2. Step 2: Convert to fraction form
    21,959.78/30,304.56 = 11,888.34/x
  3. Step 3: Cross multiply
    21,959.78x = 30,304.56 × 11,888.34
  4. Step 4: Simplify right side
    21,959.78x = 360,270,912.83
  5. Step 5: Solve for x
    x = 360,270,912.83/21,959.78
  6. Step 6: Final answer
    x = 16,405.94

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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.