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Finding the Fourth Proportional to 128,017.60, 191,680.80 and 128,017.60

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Solution

The fourth proportional to 128,017.60, 191,680.80 and 128,017.60 is: 191,680.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,017.60 : 191,680.80 = 128,017.60 : x
  2. Step 2: Convert to fraction form
    128,017.60/191,680.80 = 128,017.60/x
  3. Step 3: Cross multiply
    128,017.60x = 191,680.80 × 128,017.60
  4. Step 4: Simplify right side
    128,017.60x = 24,538,515,982.08
  5. Step 5: Solve for x
    x = 24,538,515,982.08/128,017.60
  6. Step 6: Final answer
    x = 191,680.80

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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.