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Finding the Fourth Proportional to 21,891.30, 30,208.74 and 12,939.63

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Solution

The fourth proportional to 21,891.30, 30,208.74 and 12,939.63 is: 17,855.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,891.30 : 30,208.74 = 12,939.63 : x
  2. Step 2: Convert to fraction form
    21,891.30/30,208.74 = 12,939.63/x
  3. Step 3: Cross multiply
    21,891.30x = 30,208.74 × 12,939.63
  4. Step 4: Simplify right side
    21,891.30x = 390,889,918.37
  5. Step 5: Solve for x
    x = 390,889,918.37/21,891.30
  6. Step 6: Final answer
    x = 17,855.95

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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.