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Finding the Fourth Proportional to 99,745.20, 149,790.60 and 70,369.20

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Solution

The fourth proportional to 99,745.20, 149,790.60 and 70,369.20 is: 105,675.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,745.20 : 149,790.60 = 70,369.20 : x
  2. Step 2: Convert to fraction form
    99,745.20/149,790.60 = 70,369.20/x
  3. Step 3: Cross multiply
    99,745.20x = 149,790.60 × 70,369.20
  4. Step 4: Simplify right side
    99,745.20x = 10,540,644,689.52
  5. Step 5: Solve for x
    x = 10,540,644,689.52/99,745.20
  6. Step 6: Final answer
    x = 105,675.71

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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.