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Finding the Fourth Proportional to 28,919.60, 43,395.60 and 12,276.80

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Solution

The fourth proportional to 28,919.60, 43,395.60 and 12,276.80 is: 18,422.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,919.60 : 43,395.60 = 12,276.80 : x
  2. Step 2: Convert to fraction form
    28,919.60/43,395.60 = 12,276.80/x
  3. Step 3: Cross multiply
    28,919.60x = 43,395.60 × 12,276.80
  4. Step 4: Simplify right side
    28,919.60x = 532,759,102.08
  5. Step 5: Solve for x
    x = 532,759,102.08/28,919.60
  6. Step 6: Final answer
    x = 18,422.08

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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.