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Finding the Fourth Proportional to 78,716.80, 118,075.20 and 66,469.60

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Solution

The fourth proportional to 78,716.80, 118,075.20 and 66,469.60 is: 99,704.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,716.80 : 118,075.20 = 66,469.60 : x
  2. Step 2: Convert to fraction form
    78,716.80/118,075.20 = 66,469.60/x
  3. Step 3: Cross multiply
    78,716.80x = 118,075.20 × 66,469.60
  4. Step 4: Simplify right side
    78,716.80x = 7,848,411,313.92
  5. Step 5: Solve for x
    x = 7,848,411,313.92/78,716.80
  6. Step 6: Final answer
    x = 99,704.40

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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.