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Finding the Fourth Proportional to 318,817.88, 478,289.88 and 91,115.54

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Solution

The fourth proportional to 318,817.88, 478,289.88 and 91,115.54 is: 136,691.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,817.88 : 478,289.88 = 91,115.54 : x
  2. Step 2: Convert to fraction form
    318,817.88/478,289.88 = 91,115.54/x
  3. Step 3: Cross multiply
    318,817.88x = 478,289.88 × 91,115.54
  4. Step 4: Simplify right side
    318,817.88x = 43,579,640,094.87
  5. Step 5: Solve for x
    x = 43,579,640,094.87/318,817.88
  6. Step 6: Final answer
    x = 136,691.33

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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.