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Finding the Fourth Proportional to 274,620, 378,981.36 and 155,388

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Solution

The fourth proportional to 274,620, 378,981.36 and 155,388 is: 214,438.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    274,620 : 378,981.36 = 155,388 : x
  2. Step 2: Convert to fraction form
    274,620/378,981.36 = 155,388/x
  3. Step 3: Cross multiply
    274,620x = 378,981.36 × 155,388
  4. Step 4: Simplify right side
    274,620x = 58,889,155,567.68
  5. Step 5: Solve for x
    x = 58,889,155,567.68/274,620
  6. Step 6: Final answer
    x = 214,438.70

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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.