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Finding the Fourth Proportional to 3,980,956.09, 5,971,438.24 and 989,140.09

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Solution

The fourth proportional to 3,980,956.09, 5,971,438.24 and 989,140.09 is: 1,483,711.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,980,956.09 : 5,971,438.24 = 989,140.09 : x
  2. Step 2: Convert to fraction form
    3,980,956.09/5,971,438.24 = 989,140.09/x
  3. Step 3: Cross multiply
    3,980,956.09x = 5,971,438.24 × 989,140.09
  4. Step 4: Simplify right side
    3,980,956.09x = 5,906,588,958,143.04
  5. Step 5: Solve for x
    x = 5,906,588,958,143.04/3,980,956.09
  6. Step 6: Final answer
    x = 1,483,711.15

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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.