Home / 420,778.07-631,480.59-308,747.78

Finding the Fourth Proportional to 420,778.07, 631,480.59 and 308,747.78

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Solution

The fourth proportional to 420,778.07, 631,480.59 and 308,747.78 is: 463,351.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,778.07 : 631,480.59 = 308,747.78 : x
  2. Step 2: Convert to fraction form
    420,778.07/631,480.59 = 308,747.78/x
  3. Step 3: Cross multiply
    420,778.07x = 631,480.59 × 308,747.78
  4. Step 4: Simplify right side
    420,778.07x = 194,968,230,275.59
  5. Step 5: Solve for x
    x = 194,968,230,275.59/420,778.07
  6. Step 6: Final answer
    x = 463,351.69

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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.