Home / 120,631.40-180,947.10-90,693.80

Finding the Fourth Proportional to 120,631.40, 180,947.10 and 90,693.80

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Solution

The fourth proportional to 120,631.40, 180,947.10 and 90,693.80 is: 136,040.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,631.40 : 180,947.10 = 90,693.80 : x
  2. Step 2: Convert to fraction form
    120,631.40/180,947.10 = 90,693.80/x
  3. Step 3: Cross multiply
    120,631.40x = 180,947.10 × 90,693.80
  4. Step 4: Simplify right side
    120,631.40x = 16,410,780,097.98
  5. Step 5: Solve for x
    x = 16,410,780,097.98/120,631.40
  6. Step 6: Final answer
    x = 136,040.70

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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.