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Finding the Fourth Proportional to 86,982.80, 130,279.80 and 71,430.80

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Solution

The fourth proportional to 86,982.80, 130,279.80 and 71,430.80 is: 106,986.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,982.80 : 130,279.80 = 71,430.80 : x
  2. Step 2: Convert to fraction form
    86,982.80/130,279.80 = 71,430.80/x
  3. Step 3: Cross multiply
    86,982.80x = 130,279.80 × 71,430.80
  4. Step 4: Simplify right side
    86,982.80x = 9,305,990,337.84
  5. Step 5: Solve for x
    x = 9,305,990,337.84/86,982.80
  6. Step 6: Final answer
    x = 106,986.56

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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.