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Finding the Fourth Proportional to 28,405.60, 42,608.40 and 20,111.20

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Solution

The fourth proportional to 28,405.60, 42,608.40 and 20,111.20 is: 30,166.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,405.60 : 42,608.40 = 20,111.20 : x
  2. Step 2: Convert to fraction form
    28,405.60/42,608.40 = 20,111.20/x
  3. Step 3: Cross multiply
    28,405.60x = 42,608.40 × 20,111.20
  4. Step 4: Simplify right side
    28,405.60x = 856,906,054.08
  5. Step 5: Solve for x
    x = 856,906,054.08/28,405.60
  6. Step 6: Final answer
    x = 30,166.80

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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.