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Finding the Fourth Proportional to 139,543.80, 209,315.70 and 83,556.60

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Solution

The fourth proportional to 139,543.80, 209,315.70 and 83,556.60 is: 125,334.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,543.80 : 209,315.70 = 83,556.60 : x
  2. Step 2: Convert to fraction form
    139,543.80/209,315.70 = 83,556.60/x
  3. Step 3: Cross multiply
    139,543.80x = 209,315.70 × 83,556.60
  4. Step 4: Simplify right side
    139,543.80x = 17,489,708,218.62
  5. Step 5: Solve for x
    x = 17,489,708,218.62/139,543.80
  6. Step 6: Final answer
    x = 125,334.90

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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.