Home / 21,490.40-32,235.60-12,720.80

Finding the Fourth Proportional to 21,490.40, 32,235.60 and 12,720.80

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Solution

The fourth proportional to 21,490.40, 32,235.60 and 12,720.80 is: 19,081.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,490.40 : 32,235.60 = 12,720.80 : x
  2. Step 2: Convert to fraction form
    21,490.40/32,235.60 = 12,720.80/x
  3. Step 3: Cross multiply
    21,490.40x = 32,235.60 × 12,720.80
  4. Step 4: Simplify right side
    21,490.40x = 410,062,620.48
  5. Step 5: Solve for x
    x = 410,062,620.48/21,490.40
  6. Step 6: Final answer
    x = 19,081.20

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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.