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Finding the Fourth Proportional to 30,789.90, 42,489.90 and 17,361.27

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Solution

The fourth proportional to 30,789.90, 42,489.90 and 17,361.27 is: 23,958.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,789.90 : 42,489.90 = 17,361.27 : x
  2. Step 2: Convert to fraction form
    30,789.90/42,489.90 = 17,361.27/x
  3. Step 3: Cross multiply
    30,789.90x = 42,489.90 × 17,361.27
  4. Step 4: Simplify right side
    30,789.90x = 737,678,626.17
  5. Step 5: Solve for x
    x = 737,678,626.17/30,789.90
  6. Step 6: Final answer
    x = 23,958.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.