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Finding the Fourth Proportional to 28,890.40, 43,335.60 and 20,135.20

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Solution

The fourth proportional to 28,890.40, 43,335.60 and 20,135.20 is: 30,202.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,890.40 : 43,335.60 = 20,135.20 : x
  2. Step 2: Convert to fraction form
    28,890.40/43,335.60 = 20,135.20/x
  3. Step 3: Cross multiply
    28,890.40x = 43,335.60 × 20,135.20
  4. Step 4: Simplify right side
    28,890.40x = 872,570,973.12
  5. Step 5: Solve for x
    x = 872,570,973.12/28,890.40
  6. Step 6: Final answer
    x = 30,202.80

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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.