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Finding the Fourth Proportional to 218,946.93, 328,222.72 and 78,672.75

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Solution

The fourth proportional to 218,946.93, 328,222.72 and 78,672.75 is: 117,938.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,946.93 : 328,222.72 = 78,672.75 : x
  2. Step 2: Convert to fraction form
    218,946.93/328,222.72 = 78,672.75/x
  3. Step 3: Cross multiply
    218,946.93x = 328,222.72 × 78,672.75
  4. Step 4: Simplify right side
    218,946.93x = 25,822,183,994.88
  5. Step 5: Solve for x
    x = 25,822,183,994.88/218,946.93
  6. Step 6: Final answer
    x = 117,938.10

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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.