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Finding the Fourth Proportional to 129,744.10, 194,616.15 and 85,420.90

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Solution

The fourth proportional to 129,744.10, 194,616.15 and 85,420.90 is: 128,131.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,744.10 : 194,616.15 = 85,420.90 : x
  2. Step 2: Convert to fraction form
    129,744.10/194,616.15 = 85,420.90/x
  3. Step 3: Cross multiply
    129,744.10x = 194,616.15 × 85,420.90
  4. Step 4: Simplify right side
    129,744.10x = 16,624,286,687.54
  5. Step 5: Solve for x
    x = 16,624,286,687.54/129,744.10
  6. Step 6: Final answer
    x = 128,131.35

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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.