Home / 280,905.69-421,400.55-103,399.17

Finding the Fourth Proportional to 280,905.69, 421,400.55 and 103,399.17

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Solution

The fourth proportional to 280,905.69, 421,400.55 and 103,399.17 is: 155,114.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,905.69 : 421,400.55 = 103,399.17 : x
  2. Step 2: Convert to fraction form
    280,905.69/421,400.55 = 103,399.17/x
  3. Step 3: Cross multiply
    280,905.69x = 421,400.55 × 103,399.17
  4. Step 4: Simplify right side
    280,905.69x = 43,572,467,107.54
  5. Step 5: Solve for x
    x = 43,572,467,107.54/280,905.69
  6. Step 6: Final answer
    x = 155,114.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.