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Finding the Fourth Proportional to 122,490.40, 183,735.60 and 39,392.80

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Solution

The fourth proportional to 122,490.40, 183,735.60 and 39,392.80 is: 59,089.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,490.40 : 183,735.60 = 39,392.80 : x
  2. Step 2: Convert to fraction form
    122,490.40/183,735.60 = 39,392.80/x
  3. Step 3: Cross multiply
    122,490.40x = 183,735.60 × 39,392.80
  4. Step 4: Simplify right side
    122,490.40x = 7,237,859,743.68
  5. Step 5: Solve for x
    x = 7,237,859,743.68/122,490.40
  6. Step 6: Final answer
    x = 59,089.20

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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.