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Finding the Fourth Proportional to 70,911.81, 106,330.08 and 20,985.03

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Solution

The fourth proportional to 70,911.81, 106,330.08 and 20,985.03 is: 31,466.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,911.81 : 106,330.08 = 20,985.03 : x
  2. Step 2: Convert to fraction form
    70,911.81/106,330.08 = 20,985.03/x
  3. Step 3: Cross multiply
    70,911.81x = 106,330.08 × 20,985.03
  4. Step 4: Simplify right side
    70,911.81x = 2,231,339,918.70
  5. Step 5: Solve for x
    x = 2,231,339,918.70/70,911.81
  6. Step 6: Final answer
    x = 31,466.41

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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.