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Finding the Fourth Proportional to 907,992, 1,361,484.72 and 421,143.12

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Solution

The fourth proportional to 907,992, 1,361,484.72 and 421,143.12 is: 631,481.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    907,992 : 1,361,484.72 = 421,143.12 : x
  2. Step 2: Convert to fraction form
    907,992/1,361,484.72 = 421,143.12/x
  3. Step 3: Cross multiply
    907,992x = 1,361,484.72 × 421,143.12
  4. Step 4: Simplify right side
    907,992x = 573,379,922,813.13
  5. Step 5: Solve for x
    x = 573,379,922,813.13/907,992
  6. Step 6: Final answer
    x = 631,481.25

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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.