Home / 280,490.42-420,735.63-70,128.36

Finding the Fourth Proportional to 280,490.42, 420,735.63 and 70,128.36

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Solution

The fourth proportional to 280,490.42, 420,735.63 and 70,128.36 is: 105,192.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,490.42 : 420,735.63 = 70,128.36 : x
  2. Step 2: Convert to fraction form
    280,490.42/420,735.63 = 70,128.36/x
  3. Step 3: Cross multiply
    280,490.42x = 420,735.63 × 70,128.36
  4. Step 4: Simplify right side
    280,490.42x = 29,505,498,509.28
  5. Step 5: Solve for x
    x = 29,505,498,509.28/280,490.42
  6. Step 6: Final answer
    x = 105,192.54

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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.