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Finding the Fourth Proportional to 128,680.80, 193,021.20 and 86,690.40

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Solution

The fourth proportional to 128,680.80, 193,021.20 and 86,690.40 is: 130,035.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,680.80 : 193,021.20 = 86,690.40 : x
  2. Step 2: Convert to fraction form
    128,680.80/193,021.20 = 86,690.40/x
  3. Step 3: Cross multiply
    128,680.80x = 193,021.20 × 86,690.40
  4. Step 4: Simplify right side
    128,680.80x = 16,733,085,036.48
  5. Step 5: Solve for x
    x = 16,733,085,036.48/128,680.80
  6. Step 6: Final answer
    x = 130,035.60

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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.