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Finding the Fourth Proportional to 128,015.20, 179,405.60 and 128,015.20

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Solution

The fourth proportional to 128,015.20, 179,405.60 and 128,015.20 is: 179,405.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,015.20 : 179,405.60 = 128,015.20 : x
  2. Step 2: Convert to fraction form
    128,015.20/179,405.60 = 128,015.20/x
  3. Step 3: Cross multiply
    128,015.20x = 179,405.60 × 128,015.20
  4. Step 4: Simplify right side
    128,015.20x = 22,966,643,765.12
  5. Step 5: Solve for x
    x = 22,966,643,765.12/128,015.20
  6. Step 6: Final answer
    x = 179,405.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.