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Finding the Fourth Proportional to 86,855.90, 130,065.15 and 82,919.30

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Solution

The fourth proportional to 86,855.90, 130,065.15 and 82,919.30 is: 124,170.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,855.90 : 130,065.15 = 82,919.30 : x
  2. Step 2: Convert to fraction form
    86,855.90/130,065.15 = 82,919.30/x
  3. Step 3: Cross multiply
    86,855.90x = 130,065.15 × 82,919.30
  4. Step 4: Simplify right side
    86,855.90x = 10,784,911,192.40
  5. Step 5: Solve for x
    x = 10,784,911,192.40/86,855.90
  6. Step 6: Final answer
    x = 124,170.16

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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.