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Finding the Fourth Proportional to 139,879.20, 209,818.80 and 120,852.30

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Solution

The fourth proportional to 139,879.20, 209,818.80 and 120,852.30 is: 181,278.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,879.20 : 209,818.80 = 120,852.30 : x
  2. Step 2: Convert to fraction form
    139,879.20/209,818.80 = 120,852.30/x
  3. Step 3: Cross multiply
    139,879.20x = 209,818.80 × 120,852.30
  4. Step 4: Simplify right side
    139,879.20x = 25,357,084,563.24
  5. Step 5: Solve for x
    x = 25,357,084,563.24/139,879.20
  6. Step 6: Final answer
    x = 181,278.45

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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.