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Finding the Fourth Proportional to 125,991.20, 189,059.70 and 47,113.40

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Solution

The fourth proportional to 125,991.20, 189,059.70 and 47,113.40 is: 70,697.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,991.20 : 189,059.70 = 47,113.40 : x
  2. Step 2: Convert to fraction form
    125,991.20/189,059.70 = 47,113.40/x
  3. Step 3: Cross multiply
    125,991.20x = 189,059.70 × 47,113.40
  4. Step 4: Simplify right side
    125,991.20x = 8,907,245,269.98
  5. Step 5: Solve for x
    x = 8,907,245,269.98/125,991.20
  6. Step 6: Final answer
    x = 70,697.36

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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.