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Finding the Fourth Proportional to 318,938.45, 478,411.26 and 136,544.70

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Solution

The fourth proportional to 318,938.45, 478,411.26 and 136,544.70 is: 204,818.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,938.45 : 478,411.26 = 136,544.70 : x
  2. Step 2: Convert to fraction form
    318,938.45/478,411.26 = 136,544.70/x
  3. Step 3: Cross multiply
    318,938.45x = 478,411.26 × 136,544.70
  4. Step 4: Simplify right side
    318,938.45x = 65,324,522,005.09
  5. Step 5: Solve for x
    x = 65,324,522,005.09/318,938.45
  6. Step 6: Final answer
    x = 204,818.59

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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.