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Finding the Fourth Proportional to 318,818.88, 478,291.38 and 91,116.54

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Solution

The fourth proportional to 318,818.88, 478,291.38 and 91,116.54 is: 136,692.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,818.88 : 478,291.38 = 91,116.54 : x
  2. Step 2: Convert to fraction form
    318,818.88/478,291.38 = 91,116.54/x
  3. Step 3: Cross multiply
    318,818.88x = 478,291.38 × 91,116.54
  4. Step 4: Simplify right side
    318,818.88x = 43,580,255,657.43
  5. Step 5: Solve for x
    x = 43,580,255,657.43/318,818.88
  6. Step 6: Final answer
    x = 136,692.83

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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.