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Finding the Fourth Proportional to 66,431,985.40, 99,647,978.10 and 40,789,847.80

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Solution

The fourth proportional to 66,431,985.40, 99,647,978.10 and 40,789,847.80 is: 61,184,771.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,431,985.40 : 99,647,978.10 = 40,789,847.80 : x
  2. Step 2: Convert to fraction form
    66,431,985.40/99,647,978.10 = 40,789,847.80/x
  3. Step 3: Cross multiply
    66,431,985.40x = 99,647,978.10 × 40,789,847.80
  4. Step 4: Simplify right side
    66,431,985.40x = 4,064,625,860,276,732.50
  5. Step 5: Solve for x
    x = 4,064,625,860,276,732.50/66,431,985.40
  6. Step 6: Final answer
    x = 61,184,771.70

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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.