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Finding the Fourth Proportional to 7,119.72, 10,681.72 and 2,189.70

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Solution

The fourth proportional to 7,119.72, 10,681.72 and 2,189.70 is: 3,285.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,119.72 : 10,681.72 = 2,189.70 : x
  2. Step 2: Convert to fraction form
    7,119.72/10,681.72 = 2,189.70/x
  3. Step 3: Cross multiply
    7,119.72x = 10,681.72 × 2,189.70
  4. Step 4: Simplify right side
    7,119.72x = 23,389,756.81
  5. Step 5: Solve for x
    x = 23,389,756.81/7,119.72
  6. Step 6: Final answer
    x = 3,285.21

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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.