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Finding the Fourth Proportional to 66,422,811.20, 99,648,213.60 and 28,064,580.80

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Solution

The fourth proportional to 66,422,811.20, 99,648,213.60 and 28,064,580.80 is: 42,102,785.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,422,811.20 : 99,648,213.60 = 28,064,580.80 : x
  2. Step 2: Convert to fraction form
    66,422,811.20/99,648,213.60 = 28,064,580.80/x
  3. Step 3: Cross multiply
    66,422,811.20x = 99,648,213.60 × 28,064,580.80
  4. Step 4: Simplify right side
    66,422,811.20x = 2,796,585,342,152,859
  5. Step 5: Solve for x
    x = 2,796,585,342,152,859/66,422,811.20
  6. Step 6: Final answer
    x = 42,102,785.05

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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.