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Finding the Fourth Proportional to 219,745.72, 303,260.70 and 139,143.88

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Solution

The fourth proportional to 219,745.72, 303,260.70 and 139,143.88 is: 192,025.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,745.72 : 303,260.70 = 139,143.88 : x
  2. Step 2: Convert to fraction form
    219,745.72/303,260.70 = 139,143.88/x
  3. Step 3: Cross multiply
    219,745.72x = 303,260.70 × 139,143.88
  4. Step 4: Simplify right side
    219,745.72x = 42,196,870,449.52
  5. Step 5: Solve for x
    x = 42,196,870,449.52/219,745.72
  6. Step 6: Final answer
    x = 192,025.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.