Home / 280,709.72-421,231.34-103,341.28

Finding the Fourth Proportional to 280,709.72, 421,231.34 and 103,341.28

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Solution

The fourth proportional to 280,709.72, 421,231.34 and 103,341.28 is: 155,073.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,709.72 : 421,231.34 = 103,341.28 : x
  2. Step 2: Convert to fraction form
    280,709.72/421,231.34 = 103,341.28/x
  3. Step 3: Cross multiply
    280,709.72x = 421,231.34 × 103,341.28
  4. Step 4: Simplify right side
    280,709.72x = 43,530,585,851.72
  5. Step 5: Solve for x
    x = 43,530,585,851.72/280,709.72
  6. Step 6: Final answer
    x = 155,073.31

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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.