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Finding the Fourth Proportional to 421,195.86, 631,700.91 and 121,611.33

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Solution

The fourth proportional to 421,195.86, 631,700.91 and 121,611.33 is: 182,390.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,195.86 : 631,700.91 = 121,611.33 : x
  2. Step 2: Convert to fraction form
    421,195.86/631,700.91 = 121,611.33/x
  3. Step 3: Cross multiply
    421,195.86x = 631,700.91 × 121,611.33
  4. Step 4: Simplify right side
    421,195.86x = 76,821,987,827.31
  5. Step 5: Solve for x
    x = 76,821,987,827.31/421,195.86
  6. Step 6: Final answer
    x = 182,390.18

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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.