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Finding the Fourth Proportional to 86,812.09, 130,868.80 and 81,025.40

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Solution

The fourth proportional to 86,812.09, 130,868.80 and 81,025.40 is: 122,145.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,812.09 : 130,868.80 = 81,025.40 : x
  2. Step 2: Convert to fraction form
    86,812.09/130,868.80 = 81,025.40/x
  3. Step 3: Cross multiply
    86,812.09x = 130,868.80 × 81,025.40
  4. Step 4: Simplify right side
    86,812.09x = 10,603,697,363.19
  5. Step 5: Solve for x
    x = 10,603,697,363.19/86,812.09
  6. Step 6: Final answer
    x = 122,145.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.