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Finding the Fourth Proportional to 139,640.80, 209,230.80 and 118,904.80

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Solution

The fourth proportional to 139,640.80, 209,230.80 and 118,904.80 is: 178,161.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,640.80 : 209,230.80 = 118,904.80 : x
  2. Step 2: Convert to fraction form
    139,640.80/209,230.80 = 118,904.80/x
  3. Step 3: Cross multiply
    139,640.80x = 209,230.80 × 118,904.80
  4. Step 4: Simplify right side
    139,640.80x = 24,878,546,427.84
  5. Step 5: Solve for x
    x = 24,878,546,427.84/139,640.80
  6. Step 6: Final answer
    x = 178,161.01

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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.