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Finding the Fourth Proportional to 28,672.80, 43,060.40 and 20,890.40

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Solution

The fourth proportional to 28,672.80, 43,060.40 and 20,890.40 is: 31,372.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,672.80 : 43,060.40 = 20,890.40 : x
  2. Step 2: Convert to fraction form
    28,672.80/43,060.40 = 20,890.40/x
  3. Step 3: Cross multiply
    28,672.80x = 43,060.40 × 20,890.40
  4. Step 4: Simplify right side
    28,672.80x = 899,548,980.16
  5. Step 5: Solve for x
    x = 899,548,980.16/28,672.80
  6. Step 6: Final answer
    x = 31,372.90

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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.