Home / 120,004.20-180,006.30-86,653.80

Finding the Fourth Proportional to 120,004.20, 180,006.30 and 86,653.80

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Solution

The fourth proportional to 120,004.20, 180,006.30 and 86,653.80 is: 129,980.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,004.20 : 180,006.30 = 86,653.80 : x
  2. Step 2: Convert to fraction form
    120,004.20/180,006.30 = 86,653.80/x
  3. Step 3: Cross multiply
    120,004.20x = 180,006.30 × 86,653.80
  4. Step 4: Simplify right side
    120,004.20x = 15,598,229,918.94
  5. Step 5: Solve for x
    x = 15,598,229,918.94/120,004.20
  6. Step 6: Final answer
    x = 129,980.70

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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.