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Finding the Fourth Proportional to 309,628.50, 427,288.85 and 173,669.72

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Solution

The fourth proportional to 309,628.50, 427,288.85 and 173,669.72 is: 239,665.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,628.50 : 427,288.85 = 173,669.72 : x
  2. Step 2: Convert to fraction form
    309,628.50/427,288.85 = 173,669.72/x
  3. Step 3: Cross multiply
    309,628.50x = 427,288.85 × 173,669.72
  4. Step 4: Simplify right side
    309,628.50x = 74,207,133,063.85
  5. Step 5: Solve for x
    x = 74,207,133,063.85/309,628.50
  6. Step 6: Final answer
    x = 239,665.06

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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.