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Finding the Fourth Proportional to 99,428.67, 149,120.61 and 28,349.88

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Solution

The fourth proportional to 99,428.67, 149,120.61 and 28,349.88 is: 42,518.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,428.67 : 149,120.61 = 28,349.88 : x
  2. Step 2: Convert to fraction form
    99,428.67/149,120.61 = 28,349.88/x
  3. Step 3: Cross multiply
    99,428.67x = 149,120.61 × 28,349.88
  4. Step 4: Simplify right side
    99,428.67x = 4,227,551,399.03
  5. Step 5: Solve for x
    x = 4,227,551,399.03/99,428.67
  6. Step 6: Final answer
    x = 42,518.43

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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.