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Finding the Fourth Proportional to 86,106.80, 128,929.80 and 54,772.40

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Solution

The fourth proportional to 86,106.80, 128,929.80 and 54,772.40 is: 82,012.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,106.80 : 128,929.80 = 54,772.40 : x
  2. Step 2: Convert to fraction form
    86,106.80/128,929.80 = 54,772.40/x
  3. Step 3: Cross multiply
    86,106.80x = 128,929.80 × 54,772.40
  4. Step 4: Simplify right side
    86,106.80x = 7,061,794,577.52
  5. Step 5: Solve for x
    x = 7,061,794,577.52/86,106.80
  6. Step 6: Final answer
    x = 82,012.04

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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.