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Finding the Fourth Proportional to 128,673.40, 193,043.70 and 49,790.20

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Solution

The fourth proportional to 128,673.40, 193,043.70 and 49,790.20 is: 74,698.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,673.40 : 193,043.70 = 49,790.20 : x
  2. Step 2: Convert to fraction form
    128,673.40/193,043.70 = 49,790.20/x
  3. Step 3: Cross multiply
    128,673.40x = 193,043.70 × 49,790.20
  4. Step 4: Simplify right side
    128,673.40x = 9,611,684,431.74
  5. Step 5: Solve for x
    x = 9,611,684,431.74/128,673.40
  6. Step 6: Final answer
    x = 74,698.30

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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.