Home / 13,091.20-18,065.68-7,122.80

Finding the Fourth Proportional to 13,091.20, 18,065.68 and 7,122.80

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Solution

The fourth proportional to 13,091.20, 18,065.68 and 7,122.80 is: 9,829.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,091.20 : 18,065.68 = 7,122.80 : x
  2. Step 2: Convert to fraction form
    13,091.20/18,065.68 = 7,122.80/x
  3. Step 3: Cross multiply
    13,091.20x = 18,065.68 × 7,122.80
  4. Step 4: Simplify right side
    13,091.20x = 128,678,225.50
  5. Step 5: Solve for x
    x = 128,678,225.50/13,091.20
  6. Step 6: Final answer
    x = 9,829.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.