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Finding the Fourth Proportional to 12,562.40, 18,843.60 and 8,415.20

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Solution

The fourth proportional to 12,562.40, 18,843.60 and 8,415.20 is: 12,622.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,562.40 : 18,843.60 = 8,415.20 : x
  2. Step 2: Convert to fraction form
    12,562.40/18,843.60 = 8,415.20/x
  3. Step 3: Cross multiply
    12,562.40x = 18,843.60 × 8,415.20
  4. Step 4: Simplify right side
    12,562.40x = 158,572,662.72
  5. Step 5: Solve for x
    x = 158,572,662.72/12,562.40
  6. Step 6: Final answer
    x = 12,622.80

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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.