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Finding the Fourth Proportional to 85,786.20, 128,679.30 and 79,954.20

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Solution

The fourth proportional to 85,786.20, 128,679.30 and 79,954.20 is: 119,931.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,786.20 : 128,679.30 = 79,954.20 : x
  2. Step 2: Convert to fraction form
    85,786.20/128,679.30 = 79,954.20/x
  3. Step 3: Cross multiply
    85,786.20x = 128,679.30 × 79,954.20
  4. Step 4: Simplify right side
    85,786.20x = 10,288,450,488.06
  5. Step 5: Solve for x
    x = 10,288,450,488.06/85,786.20
  6. Step 6: Final answer
    x = 119,931.30

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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.