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Finding the Fourth Proportional to 86,980.80, 130,276.80 and 71,428.80

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Solution

The fourth proportional to 86,980.80, 130,276.80 and 71,428.80 is: 106,983.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,980.80 : 130,276.80 = 71,428.80 : x
  2. Step 2: Convert to fraction form
    86,980.80/130,276.80 = 71,428.80/x
  3. Step 3: Cross multiply
    86,980.80x = 130,276.80 × 71,428.80
  4. Step 4: Simplify right side
    86,980.80x = 9,305,515,491.84
  5. Step 5: Solve for x
    x = 9,305,515,491.84/86,980.80
  6. Step 6: Final answer
    x = 106,983.56

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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.