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Finding the Fourth Proportional to 21,889.31, 30,206.79 and 13,390.79

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Solution

The fourth proportional to 21,889.31, 30,206.79 and 13,390.79 is: 18,479.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,889.31 : 30,206.79 = 13,390.79 : x
  2. Step 2: Convert to fraction form
    21,889.31/30,206.79 = 13,390.79/x
  3. Step 3: Cross multiply
    21,889.31x = 30,206.79 × 13,390.79
  4. Step 4: Simplify right side
    21,889.31x = 404,492,630.43
  5. Step 5: Solve for x
    x = 404,492,630.43/21,889.31
  6. Step 6: Final answer
    x = 18,479.01

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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.