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Finding the Fourth Proportional to 122,817.20, 183,788.40 and 85,200.80

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Solution

The fourth proportional to 122,817.20, 183,788.40 and 85,200.80 is: 127,497.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,817.20 : 183,788.40 = 85,200.80 : x
  2. Step 2: Convert to fraction form
    122,817.20/183,788.40 = 85,200.80/x
  3. Step 3: Cross multiply
    122,817.20x = 183,788.40 × 85,200.80
  4. Step 4: Simplify right side
    122,817.20x = 15,658,918,710.72
  5. Step 5: Solve for x
    x = 15,658,918,710.72/122,817.20
  6. Step 6: Final answer
    x = 127,497.77

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1.5x scale

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.