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Finding the Fourth Proportional to 199,619.20, 299,428.80 and 120,887.20

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Solution

The fourth proportional to 199,619.20, 299,428.80 and 120,887.20 is: 181,330.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    199,619.20 : 299,428.80 = 120,887.20 : x
  2. Step 2: Convert to fraction form
    199,619.20/299,428.80 = 120,887.20/x
  3. Step 3: Cross multiply
    199,619.20x = 299,428.80 × 120,887.20
  4. Step 4: Simplify right side
    199,619.20x = 36,197,109,231.36
  5. Step 5: Solve for x
    x = 36,197,109,231.36/199,619.20
  6. Step 6: Final answer
    x = 181,330.80

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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.