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Finding the Fourth Proportional to 141,991.70, 212,728.35 and 86,522.90

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Solution

The fourth proportional to 141,991.70, 212,728.35 and 86,522.90 is: 129,626.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    141,991.70 : 212,728.35 = 86,522.90 : x
  2. Step 2: Convert to fraction form
    141,991.70/212,728.35 = 86,522.90/x
  3. Step 3: Cross multiply
    141,991.70x = 212,728.35 × 86,522.90
  4. Step 4: Simplify right side
    141,991.70x = 18,405,873,754.22
  5. Step 5: Solve for x
    x = 18,405,873,754.22/141,991.70
  6. Step 6: Final answer
    x = 129,626.41

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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.