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Finding the Fourth Proportional to 421,190.13, 631,692.26 and 121,605.54

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Solution

The fourth proportional to 421,190.13, 631,692.26 and 121,605.54 is: 182,381.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,190.13 : 631,692.26 = 121,605.54 : x
  2. Step 2: Convert to fraction form
    421,190.13/631,692.26 = 121,605.54/x
  3. Step 3: Cross multiply
    421,190.13x = 631,692.26 × 121,605.54
  4. Step 4: Simplify right side
    421,190.13x = 76,817,277,783.09
  5. Step 5: Solve for x
    x = 76,817,277,783.09/421,190.13
  6. Step 6: Final answer
    x = 182,381.48

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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.