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Finding the Fourth Proportional to 122,639.60, 183,959.40 and 80,649.20

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Solution

The fourth proportional to 122,639.60, 183,959.40 and 80,649.20 is: 120,973.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,639.60 : 183,959.40 = 80,649.20 : x
  2. Step 2: Convert to fraction form
    122,639.60/183,959.40 = 80,649.20/x
  3. Step 3: Cross multiply
    122,639.60x = 183,959.40 × 80,649.20
  4. Step 4: Simplify right side
    122,639.60x = 14,836,178,442.48
  5. Step 5: Solve for x
    x = 14,836,178,442.48/122,639.60
  6. Step 6: Final answer
    x = 120,973.80

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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.