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Finding the Fourth Proportional to 78,715.20, 118,072.80 and 63,163.20

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Solution

The fourth proportional to 78,715.20, 118,072.80 and 63,163.20 is: 94,744.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,715.20 : 118,072.80 = 63,163.20 : x
  2. Step 2: Convert to fraction form
    78,715.20/118,072.80 = 63,163.20/x
  3. Step 3: Cross multiply
    78,715.20x = 118,072.80 × 63,163.20
  4. Step 4: Simplify right side
    78,715.20x = 7,457,855,880.96
  5. Step 5: Solve for x
    x = 7,457,855,880.96/78,715.20
  6. Step 6: Final answer
    x = 94,744.80

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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.