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Finding the Fourth Proportional to 128,710.40, 193,065.60 and 97,606.40

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Solution

The fourth proportional to 128,710.40, 193,065.60 and 97,606.40 is: 146,409.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,710.40 : 193,065.60 = 97,606.40 : x
  2. Step 2: Convert to fraction form
    128,710.40/193,065.60 = 97,606.40/x
  3. Step 3: Cross multiply
    128,710.40x = 193,065.60 × 97,606.40
  4. Step 4: Simplify right side
    128,710.40x = 18,844,438,179.84
  5. Step 5: Solve for x
    x = 18,844,438,179.84/128,710.40
  6. Step 6: Final answer
    x = 146,409.60

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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.