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Finding the Fourth Proportional to 245,620, 338,955.60 and 139,636

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Solution

The fourth proportional to 245,620, 338,955.60 and 139,636 is: 192,697.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,620 : 338,955.60 = 139,636 : x
  2. Step 2: Convert to fraction form
    245,620/338,955.60 = 139,636/x
  3. Step 3: Cross multiply
    245,620x = 338,955.60 × 139,636
  4. Step 4: Simplify right side
    245,620x = 47,330,404,161.60
  5. Step 5: Solve for x
    x = 47,330,404,161.60/245,620
  6. Step 6: Final answer
    x = 192,697.68

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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.