Home / 7,121.34-10,681.40-2,190.50

Finding the Fourth Proportional to 7,121.34, 10,681.40 and 2,190.50

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Solution

The fourth proportional to 7,121.34, 10,681.40 and 2,190.50 is: 3,285.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.34 : 10,681.40 = 2,190.50 : x
  2. Step 2: Convert to fraction form
    7,121.34/10,681.40 = 2,190.50/x
  3. Step 3: Cross multiply
    7,121.34x = 10,681.40 × 2,190.50
  4. Step 4: Simplify right side
    7,121.34x = 23,397,606.70
  5. Step 5: Solve for x
    x = 23,397,606.70/7,121.34
  6. Step 6: Final answer
    x = 3,285.56

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Double scale
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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.