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Finding the Fourth Proportional to 122,434.60, 183,651.90 and 85,109.80

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Solution

The fourth proportional to 122,434.60, 183,651.90 and 85,109.80 is: 127,664.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,434.60 : 183,651.90 = 85,109.80 : x
  2. Step 2: Convert to fraction form
    122,434.60/183,651.90 = 85,109.80/x
  3. Step 3: Cross multiply
    122,434.60x = 183,651.90 × 85,109.80
  4. Step 4: Simplify right side
    122,434.60x = 15,630,576,478.62
  5. Step 5: Solve for x
    x = 15,630,576,478.62/122,434.60
  6. Step 6: Final answer
    x = 127,664.70

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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.