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Finding the Fourth Proportional to 86,994,640.80, 130,379,986.80 and 66,699,280.80

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Solution

The fourth proportional to 86,994,640.80, 130,379,986.80 and 66,699,280.80 is: 99,963,069.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,994,640.80 : 130,379,986.80 = 66,699,280.80 : x
  2. Step 2: Convert to fraction form
    86,994,640.80/130,379,986.80 = 66,699,280.80/x
  3. Step 3: Cross multiply
    86,994,640.80x = 130,379,986.80 × 66,699,280.80
  4. Step 4: Simplify right side
    86,994,640.80x = 8,696,251,350,273,493
  5. Step 5: Solve for x
    x = 8,696,251,350,273,493/86,994,640.80
  6. Step 6: Final answer
    x = 99,963,069.80

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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.