Home / 10,271.20-15,406.80-7,679.20

Finding the Fourth Proportional to 10,271.20, 15,406.80 and 7,679.20

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Solution

The fourth proportional to 10,271.20, 15,406.80 and 7,679.20 is: 11,518.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,271.20 : 15,406.80 = 7,679.20 : x
  2. Step 2: Convert to fraction form
    10,271.20/15,406.80 = 7,679.20/x
  3. Step 3: Cross multiply
    10,271.20x = 15,406.80 × 7,679.20
  4. Step 4: Simplify right side
    10,271.20x = 118,311,898.56
  5. Step 5: Solve for x
    x = 118,311,898.56/10,271.20
  6. Step 6: Final answer
    x = 11,518.80

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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.