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Finding the Fourth Proportional to 28,978,392.80, 43,467,589.20 and 8,781,010.40

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Solution

The fourth proportional to 28,978,392.80, 43,467,589.20 and 8,781,010.40 is: 13,171,515.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978,392.80 : 43,467,589.20 = 8,781,010.40 : x
  2. Step 2: Convert to fraction form
    28,978,392.80/43,467,589.20 = 8,781,010.40/x
  3. Step 3: Cross multiply
    28,978,392.80x = 43,467,589.20 × 8,781,010.40
  4. Step 4: Simplify right side
    28,978,392.80x = 381,689,352,828,127.75
  5. Step 5: Solve for x
    x = 381,689,352,828,127.75/28,978,392.80
  6. Step 6: Final answer
    x = 13,171,515.60

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Similar ratio
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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.