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Finding the Fourth Proportional to 445,817.60, 668,726.40 and 421,323.20

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Solution

The fourth proportional to 445,817.60, 668,726.40 and 421,323.20 is: 631,984.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    445,817.60 : 668,726.40 = 421,323.20 : x
  2. Step 2: Convert to fraction form
    445,817.60/668,726.40 = 421,323.20/x
  3. Step 3: Cross multiply
    445,817.60x = 668,726.40 × 421,323.20
  4. Step 4: Simplify right side
    445,817.60x = 281,749,946,772.48
  5. Step 5: Solve for x
    x = 281,749,946,772.48/445,817.60
  6. Step 6: Final answer
    x = 631,984.80

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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.