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Finding the Fourth Proportional to 86,982.80, 130,474.20 and 51,990.80

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Solution

The fourth proportional to 86,982.80, 130,474.20 and 51,990.80 is: 77,986.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,982.80 : 130,474.20 = 51,990.80 : x
  2. Step 2: Convert to fraction form
    86,982.80/130,474.20 = 51,990.80/x
  3. Step 3: Cross multiply
    86,982.80x = 130,474.20 × 51,990.80
  4. Step 4: Simplify right side
    86,982.80x = 6,783,458,037.36
  5. Step 5: Solve for x
    x = 6,783,458,037.36/86,982.80
  6. Step 6: Final answer
    x = 77,986.20

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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.