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Finding the Fourth Proportional to 421,918.85, 632,797.63 and 126,430.85

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Solution

The fourth proportional to 421,918.85, 632,797.63 and 126,430.85 is: 189,622.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,918.85 : 632,797.63 = 126,430.85 : x
  2. Step 2: Convert to fraction form
    421,918.85/632,797.63 = 126,430.85/x
  3. Step 3: Cross multiply
    421,918.85x = 632,797.63 × 126,430.85
  4. Step 4: Simplify right side
    421,918.85x = 80,005,142,238.89
  5. Step 5: Solve for x
    x = 80,005,142,238.89/421,918.85
  6. Step 6: Final answer
    x = 189,622.11

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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.