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Finding the Fourth Proportional to 128,040.60, 192,060.90 and 121,479.60

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Solution

The fourth proportional to 128,040.60, 192,060.90 and 121,479.60 is: 182,219.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,040.60 : 192,060.90 = 121,479.60 : x
  2. Step 2: Convert to fraction form
    128,040.60/192,060.90 = 121,479.60/x
  3. Step 3: Cross multiply
    128,040.60x = 192,060.90 × 121,479.60
  4. Step 4: Simplify right side
    128,040.60x = 23,331,481,307.64
  5. Step 5: Solve for x
    x = 23,331,481,307.64/128,040.60
  6. Step 6: Final answer
    x = 182,219.40

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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.