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Finding the Fourth Proportional to 318,778.58, 477,809.03 and 139,015.28

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Solution

The fourth proportional to 318,778.58, 477,809.03 and 139,015.28 is: 208,366.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,778.58 : 477,809.03 = 139,015.28 : x
  2. Step 2: Convert to fraction form
    318,778.58/477,809.03 = 139,015.28/x
  3. Step 3: Cross multiply
    318,778.58x = 477,809.03 × 139,015.28
  4. Step 4: Simplify right side
    318,778.58x = 66,422,756,091.98
  5. Step 5: Solve for x
    x = 66,422,756,091.98/318,778.58
  6. Step 6: Final answer
    x = 208,366.43

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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.