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Finding the Fourth Proportional to 68,920,244.80, 103,379,445.60 and 21,051,419.20

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Solution

The fourth proportional to 68,920,244.80, 103,379,445.60 and 21,051,419.20 is: 31,576,847.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,920,244.80 : 103,379,445.60 = 21,051,419.20 : x
  2. Step 2: Convert to fraction form
    68,920,244.80/103,379,445.60 = 21,051,419.20/x
  3. Step 3: Cross multiply
    68,920,244.80x = 103,379,445.60 × 21,051,419.20
  4. Step 4: Simplify right side
    68,920,244.80x = 2,176,284,045,989,195.25
  5. Step 5: Solve for x
    x = 2,176,284,045,989,195.25/68,920,244.80
  6. Step 6: Final answer
    x = 31,576,847.30

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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.