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Finding the Fourth Proportional to 78,940.89, 118,414.98 and 19,777.08

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Solution

The fourth proportional to 78,940.89, 118,414.98 and 19,777.08 is: 29,666.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,940.89 : 118,414.98 = 19,777.08 : x
  2. Step 2: Convert to fraction form
    78,940.89/118,414.98 = 19,777.08/x
  3. Step 3: Cross multiply
    78,940.89x = 118,414.98 × 19,777.08
  4. Step 4: Simplify right side
    78,940.89x = 2,341,902,532.66
  5. Step 5: Solve for x
    x = 2,341,902,532.66/78,940.89
  6. Step 6: Final answer
    x = 29,666.53

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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.