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Finding the Fourth Proportional to 85,719.80, 128,215.20 and 76,898.90

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Solution

The fourth proportional to 85,719.80, 128,215.20 and 76,898.90 is: 115,021.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,719.80 : 128,215.20 = 76,898.90 : x
  2. Step 2: Convert to fraction form
    85,719.80/128,215.20 = 76,898.90/x
  3. Step 3: Cross multiply
    85,719.80x = 128,215.20 × 76,898.90
  4. Step 4: Simplify right side
    85,719.80x = 9,859,607,843.28
  5. Step 5: Solve for x
    x = 9,859,607,843.28/85,719.80
  6. Step 6: Final answer
    x = 115,021.36

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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.