Home / 7,485.80-11,228.70-7,121.30

Finding the Fourth Proportional to 7,485.80, 11,228.70 and 7,121.30

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Solution

The fourth proportional to 7,485.80, 11,228.70 and 7,121.30 is: 10,681.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,485.80 : 11,228.70 = 7,121.30 : x
  2. Step 2: Convert to fraction form
    7,485.80/11,228.70 = 7,121.30/x
  3. Step 3: Cross multiply
    7,485.80x = 11,228.70 × 7,121.30
  4. Step 4: Simplify right side
    7,485.80x = 79,962,941.31
  5. Step 5: Solve for x
    x = 79,962,941.31/7,485.80
  6. Step 6: Final answer
    x = 10,681.95

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Similar ratio
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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.