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Finding the Fourth Proportional to 139,539.80, 209,309.70 and 123,210.20

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Solution

The fourth proportional to 139,539.80, 209,309.70 and 123,210.20 is: 184,815.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,539.80 : 209,309.70 = 123,210.20 : x
  2. Step 2: Convert to fraction form
    139,539.80/209,309.70 = 123,210.20/x
  3. Step 3: Cross multiply
    139,539.80x = 209,309.70 × 123,210.20
  4. Step 4: Simplify right side
    139,539.80x = 25,789,089,998.94
  5. Step 5: Solve for x
    x = 25,789,089,998.94/139,539.80
  6. Step 6: Final answer
    x = 184,815.30

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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.