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Finding the Fourth Proportional to 139,770.80, 209,656.20 and 83,783.60

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Solution

The fourth proportional to 139,770.80, 209,656.20 and 83,783.60 is: 125,675.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,770.80 : 209,656.20 = 83,783.60 : x
  2. Step 2: Convert to fraction form
    139,770.80/209,656.20 = 83,783.60/x
  3. Step 3: Cross multiply
    139,770.80x = 209,656.20 × 83,783.60
  4. Step 4: Simplify right side
    139,770.80x = 17,565,751,198.32
  5. Step 5: Solve for x
    x = 17,565,751,198.32/139,770.80
  6. Step 6: Final answer
    x = 125,675.40

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1.5x scale

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.