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Finding the Fourth Proportional to 139,638.80, 209,227.80 and 118,902.80

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Solution

The fourth proportional to 139,638.80, 209,227.80 and 118,902.80 is: 178,158.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,638.80 : 209,227.80 = 118,902.80 : x
  2. Step 2: Convert to fraction form
    139,638.80/209,227.80 = 118,902.80/x
  3. Step 3: Cross multiply
    139,638.80x = 209,227.80 × 118,902.80
  4. Step 4: Simplify right side
    139,638.80x = 24,877,771,257.84
  5. Step 5: Solve for x
    x = 24,877,771,257.84/139,638.80
  6. Step 6: Final answer
    x = 178,158.01

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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.