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Finding the Fourth Proportional to 86,678.80, 130,018.20 and 76,829.20

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Solution

The fourth proportional to 86,678.80, 130,018.20 and 76,829.20 is: 115,243.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,678.80 : 130,018.20 = 76,829.20 : x
  2. Step 2: Convert to fraction form
    86,678.80/130,018.20 = 76,829.20/x
  3. Step 3: Cross multiply
    86,678.80x = 130,018.20 × 76,829.20
  4. Step 4: Simplify right side
    86,678.80x = 9,989,194,291.44
  5. Step 5: Solve for x
    x = 9,989,194,291.44/86,678.80
  6. Step 6: Final answer
    x = 115,243.80

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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.