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Finding the Fourth Proportional to 86,738.80, 130,108.20 and 76,889.20

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Solution

The fourth proportional to 86,738.80, 130,108.20 and 76,889.20 is: 115,333.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,738.80 : 130,108.20 = 76,889.20 : x
  2. Step 2: Convert to fraction form
    86,738.80/130,108.20 = 76,889.20/x
  3. Step 3: Cross multiply
    86,738.80x = 130,108.20 × 76,889.20
  4. Step 4: Simplify right side
    86,738.80x = 10,003,915,411.44
  5. Step 5: Solve for x
    x = 10,003,915,411.44/86,738.80
  6. Step 6: Final answer
    x = 115,333.80

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1.5x scale

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.