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Finding the Fourth Proportional to 139,775.20, 209,662.80 and 122,279.20

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Solution

The fourth proportional to 139,775.20, 209,662.80 and 122,279.20 is: 183,418.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,775.20 : 209,662.80 = 122,279.20 : x
  2. Step 2: Convert to fraction form
    139,775.20/209,662.80 = 122,279.20/x
  3. Step 3: Cross multiply
    139,775.20x = 209,662.80 × 122,279.20
  4. Step 4: Simplify right side
    139,775.20x = 25,637,399,453.76
  5. Step 5: Solve for x
    x = 25,637,399,453.76/139,775.20
  6. Step 6: Final answer
    x = 183,418.80

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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.