Home / 120,621.80-180,932.70-78,631.40

Finding the Fourth Proportional to 120,621.80, 180,932.70 and 78,631.40

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Solution

The fourth proportional to 120,621.80, 180,932.70 and 78,631.40 is: 117,947.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,621.80 : 180,932.70 = 78,631.40 : x
  2. Step 2: Convert to fraction form
    120,621.80/180,932.70 = 78,631.40/x
  3. Step 3: Cross multiply
    120,621.80x = 180,932.70 × 78,631.40
  4. Step 4: Simplify right side
    120,621.80x = 14,226,991,506.78
  5. Step 5: Solve for x
    x = 14,226,991,506.78/120,621.80
  6. Step 6: Final answer
    x = 117,947.10

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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.