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Finding the Fourth Proportional to 141,989.70, 212,725.35 and 86,520.90

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Solution

The fourth proportional to 141,989.70, 212,725.35 and 86,520.90 is: 129,623.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    141,989.70 : 212,725.35 = 86,520.90 : x
  2. Step 2: Convert to fraction form
    141,989.70/212,725.35 = 86,520.90/x
  3. Step 3: Cross multiply
    141,989.70x = 212,725.35 × 86,520.90
  4. Step 4: Simplify right side
    141,989.70x = 18,405,188,734.82
  5. Step 5: Solve for x
    x = 18,405,188,734.82/141,989.70
  6. Step 6: Final answer
    x = 129,623.41

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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.