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Finding the Fourth Proportional to 16,821.60, 25,232.40 and 12,415.20

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Solution

The fourth proportional to 16,821.60, 25,232.40 and 12,415.20 is: 18,622.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,821.60 : 25,232.40 = 12,415.20 : x
  2. Step 2: Convert to fraction form
    16,821.60/25,232.40 = 12,415.20/x
  3. Step 3: Cross multiply
    16,821.60x = 25,232.40 × 12,415.20
  4. Step 4: Simplify right side
    16,821.60x = 313,265,292.48
  5. Step 5: Solve for x
    x = 313,265,292.48/16,821.60
  6. Step 6: Final answer
    x = 18,622.80

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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.