Home / 21,979-30,330.54-13,484.44

Finding the Fourth Proportional to 21,979, 30,330.54 and 13,484.44

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Solution

The fourth proportional to 21,979, 30,330.54 and 13,484.44 is: 18,608.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,979 : 30,330.54 = 13,484.44 : x
  2. Step 2: Convert to fraction form
    21,979/30,330.54 = 13,484.44/x
  3. Step 3: Cross multiply
    21,979x = 30,330.54 × 13,484.44
  4. Step 4: Simplify right side
    21,979x = 408,990,346.80
  5. Step 5: Solve for x
    x = 408,990,346.80/21,979
  6. Step 6: Final answer
    x = 18,608.23

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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.