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Finding the Fourth Proportional to 86,937.40, 130,406.10 and 81,105.40

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Solution

The fourth proportional to 86,937.40, 130,406.10 and 81,105.40 is: 121,658.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,937.40 : 130,406.10 = 81,105.40 : x
  2. Step 2: Convert to fraction form
    86,937.40/130,406.10 = 81,105.40/x
  3. Step 3: Cross multiply
    86,937.40x = 130,406.10 × 81,105.40
  4. Step 4: Simplify right side
    86,937.40x = 10,576,638,902.94
  5. Step 5: Solve for x
    x = 10,576,638,902.94/86,937.40
  6. Step 6: Final answer
    x = 121,658.10

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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.