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Finding the Fourth Proportional to 66,199,621.80, 99,299,432.70 and 20,761,343.40

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Solution

The fourth proportional to 66,199,621.80, 99,299,432.70 and 20,761,343.40 is: 31,142,015.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,199,621.80 : 99,299,432.70 = 20,761,343.40 : x
  2. Step 2: Convert to fraction form
    66,199,621.80/99,299,432.70 = 20,761,343.40/x
  3. Step 3: Cross multiply
    66,199,621.80x = 99,299,432.70 × 20,761,343.40
  4. Step 4: Simplify right side
    66,199,621.80x = 2,061,589,621,709,889
  5. Step 5: Solve for x
    x = 2,061,589,621,709,889/66,199,621.80
  6. Step 6: Final answer
    x = 31,142,015.10

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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.