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Finding the Fourth Proportional to 28,928.80, 43,393.20 and 18,431.20

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Solution

The fourth proportional to 28,928.80, 43,393.20 and 18,431.20 is: 27,646.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,928.80 : 43,393.20 = 18,431.20 : x
  2. Step 2: Convert to fraction form
    28,928.80/43,393.20 = 18,431.20/x
  3. Step 3: Cross multiply
    28,928.80x = 43,393.20 × 18,431.20
  4. Step 4: Simplify right side
    28,928.80x = 799,788,747.84
  5. Step 5: Solve for x
    x = 799,788,747.84/28,928.80
  6. Step 6: Final answer
    x = 27,646.80

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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.