Home / 21,346.68-31,865.94-20,388.12

Finding the Fourth Proportional to 21,346.68, 31,865.94 and 20,388.12

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Solution

The fourth proportional to 21,346.68, 31,865.94 and 20,388.12 is: 30,435.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,346.68 : 31,865.94 = 20,388.12 : x
  2. Step 2: Convert to fraction form
    21,346.68/31,865.94 = 20,388.12/x
  3. Step 3: Cross multiply
    21,346.68x = 31,865.94 × 20,388.12
  4. Step 4: Simplify right side
    21,346.68x = 649,686,608.63
  5. Step 5: Solve for x
    x = 649,686,608.63/21,346.68
  6. Step 6: Final answer
    x = 30,435.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.