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Finding the Fourth Proportional to 76,638,701.80, 114,958,052.70 and 69,080,429.80

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Solution

The fourth proportional to 76,638,701.80, 114,958,052.70 and 69,080,429.80 is: 103,620,644.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,638,701.80 : 114,958,052.70 = 69,080,429.80 : x
  2. Step 2: Convert to fraction form
    76,638,701.80/114,958,052.70 = 69,080,429.80/x
  3. Step 3: Cross multiply
    76,638,701.80x = 114,958,052.70 × 69,080,429.80
  4. Step 4: Simplify right side
    76,638,701.80x = 7,941,351,689,487,050
  5. Step 5: Solve for x
    x = 7,941,351,689,487,050/76,638,701.80
  6. Step 6: Final answer
    x = 103,620,644.70

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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.