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Finding the Fourth Proportional to 86,693.70, 130,040.55 and 78,399.30

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Solution

The fourth proportional to 86,693.70, 130,040.55 and 78,399.30 is: 117,598.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,693.70 : 130,040.55 = 78,399.30 : x
  2. Step 2: Convert to fraction form
    86,693.70/130,040.55 = 78,399.30/x
  3. Step 3: Cross multiply
    86,693.70x = 130,040.55 × 78,399.30
  4. Step 4: Simplify right side
    86,693.70x = 10,195,088,091.62
  5. Step 5: Solve for x
    x = 10,195,088,091.62/86,693.70
  6. Step 6: Final answer
    x = 117,598.95

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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.