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Finding the Fourth Proportional to 86,855.40, 130,064.40 and 82,918.80

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Solution

The fourth proportional to 86,855.40, 130,064.40 and 82,918.80 is: 124,169.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,855.40 : 130,064.40 = 82,918.80 : x
  2. Step 2: Convert to fraction form
    86,855.40/130,064.40 = 82,918.80/x
  3. Step 3: Cross multiply
    86,855.40x = 130,064.40 × 82,918.80
  4. Step 4: Simplify right side
    86,855.40x = 10,784,783,970.72
  5. Step 5: Solve for x
    x = 10,784,783,970.72/86,855.40
  6. Step 6: Final answer
    x = 124,169.41

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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.