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Finding the Fourth Proportional to 199,915.78, 299,725.44 and 121,012.06

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Solution

The fourth proportional to 199,915.78, 299,725.44 and 121,012.06 is: 181,428.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    199,915.78 : 299,725.44 = 121,012.06 : x
  2. Step 2: Convert to fraction form
    199,915.78/299,725.44 = 121,012.06/x
  3. Step 3: Cross multiply
    199,915.78x = 299,725.44 × 121,012.06
  4. Step 4: Simplify right side
    199,915.78x = 36,270,392,928.81
  5. Step 5: Solve for x
    x = 36,270,392,928.81/199,915.78
  6. Step 6: Final answer
    x = 181,428.36

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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.