Home / 21,405.40-32,021.70-18,515.80

Finding the Fourth Proportional to 21,405.40, 32,021.70 and 18,515.80

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Solution

The fourth proportional to 21,405.40, 32,021.70 and 18,515.80 is: 27,698.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,405.40 : 32,021.70 = 18,515.80 : x
  2. Step 2: Convert to fraction form
    21,405.40/32,021.70 = 18,515.80/x
  3. Step 3: Cross multiply
    21,405.40x = 32,021.70 × 18,515.80
  4. Step 4: Simplify right side
    21,405.40x = 592,907,392.86
  5. Step 5: Solve for x
    x = 592,907,392.86/21,405.40
  6. Step 6: Final answer
    x = 27,698.96

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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.