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Finding the Fourth Proportional to 98,905.78, 148,363.80 and 28,790.56

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Solution

The fourth proportional to 98,905.78, 148,363.80 and 28,790.56 is: 43,187.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,905.78 : 148,363.80 = 28,790.56 : x
  2. Step 2: Convert to fraction form
    98,905.78/148,363.80 = 28,790.56/x
  3. Step 3: Cross multiply
    98,905.78x = 148,363.80 × 28,790.56
  4. Step 4: Simplify right side
    98,905.78x = 4,271,476,885.73
  5. Step 5: Solve for x
    x = 4,271,476,885.73/98,905.78
  6. Step 6: Final answer
    x = 43,187.33

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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.