Home / 21,889.40-30,207.16-13,390.08

Finding the Fourth Proportional to 21,889.40, 30,207.16 and 13,390.08

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Solution

The fourth proportional to 21,889.40, 30,207.16 and 13,390.08 is: 18,478.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,889.40 : 30,207.16 = 13,390.08 : x
  2. Step 2: Convert to fraction form
    21,889.40/30,207.16 = 13,390.08/x
  3. Step 3: Cross multiply
    21,889.40x = 30,207.16 × 13,390.08
  4. Step 4: Simplify right side
    21,889.40x = 404,476,288.97
  5. Step 5: Solve for x
    x = 404,476,288.97/21,889.40
  6. Step 6: Final answer
    x = 18,478.18

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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.