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Finding the Fourth Proportional to 7,421.70, 11,128.56 and 2,489.70

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Solution

The fourth proportional to 7,421.70, 11,128.56 and 2,489.70 is: 3,733.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,421.70 : 11,128.56 = 2,489.70 : x
  2. Step 2: Convert to fraction form
    7,421.70/11,128.56 = 2,489.70/x
  3. Step 3: Cross multiply
    7,421.70x = 11,128.56 × 2,489.70
  4. Step 4: Simplify right side
    7,421.70x = 27,706,775.83
  5. Step 5: Solve for x
    x = 27,706,775.83/7,421.70
  6. Step 6: Final answer
    x = 3,733.21

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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.