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Finding the Fourth Proportional to 28,928.60, 43,392.90 and 21,152.60

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Solution

The fourth proportional to 28,928.60, 43,392.90 and 21,152.60 is: 31,728.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,928.60 : 43,392.90 = 21,152.60 : x
  2. Step 2: Convert to fraction form
    28,928.60/43,392.90 = 21,152.60/x
  3. Step 3: Cross multiply
    28,928.60x = 43,392.90 × 21,152.60
  4. Step 4: Simplify right side
    28,928.60x = 917,872,656.54
  5. Step 5: Solve for x
    x = 917,872,656.54/28,928.60
  6. Step 6: Final answer
    x = 31,728.90

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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.