Home / 21,213.60-31,820.40-18,621.60

Finding the Fourth Proportional to 21,213.60, 31,820.40 and 18,621.60

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Solution

The fourth proportional to 21,213.60, 31,820.40 and 18,621.60 is: 27,932.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,213.60 : 31,820.40 = 18,621.60 : x
  2. Step 2: Convert to fraction form
    21,213.60/31,820.40 = 18,621.60/x
  3. Step 3: Cross multiply
    21,213.60x = 31,820.40 × 18,621.60
  4. Step 4: Simplify right side
    21,213.60x = 592,546,760.64
  5. Step 5: Solve for x
    x = 592,546,760.64/21,213.60
  6. Step 6: Final answer
    x = 27,932.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.