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Finding the Fourth Proportional to 309,216.76, 426,734.54 and 188,338.71

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Solution

The fourth proportional to 309,216.76, 426,734.54 and 188,338.71 is: 259,916.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,216.76 : 426,734.54 = 188,338.71 : x
  2. Step 2: Convert to fraction form
    309,216.76/426,734.54 = 188,338.71/x
  3. Step 3: Cross multiply
    309,216.76x = 426,734.54 × 188,338.71
  4. Step 4: Simplify right side
    309,216.76x = 80,370,632,776.04
  5. Step 5: Solve for x
    x = 80,370,632,776.04/309,216.76
  6. Step 6: Final answer
    x = 259,916.81

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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.