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Finding the Fourth Proportional to 28,404.64, 42,608.88 and 20,705.44

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Solution

The fourth proportional to 28,404.64, 42,608.88 and 20,705.44 is: 31,059.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,404.64 : 42,608.88 = 20,705.44 : x
  2. Step 2: Convert to fraction form
    28,404.64/42,608.88 = 20,705.44/x
  3. Step 3: Cross multiply
    28,404.64x = 42,608.88 × 20,705.44
  4. Step 4: Simplify right side
    28,404.64x = 882,235,608.31
  5. Step 5: Solve for x
    x = 882,235,608.31/28,404.64
  6. Step 6: Final answer
    x = 31,059.56

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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.