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Finding the Fourth Proportional to 78,978.02, 118,467.21 and 39,495.38

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Solution

The fourth proportional to 78,978.02, 118,467.21 and 39,495.38 is: 59,243.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,978.02 : 118,467.21 = 39,495.38 : x
  2. Step 2: Convert to fraction form
    78,978.02/118,467.21 = 39,495.38/x
  3. Step 3: Cross multiply
    78,978.02x = 118,467.21 × 39,495.38
  4. Step 4: Simplify right side
    78,978.02x = 4,678,907,476.49
  5. Step 5: Solve for x
    x = 4,678,907,476.49/78,978.02
  6. Step 6: Final answer
    x = 59,243.16

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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.