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Finding the Fourth Proportional to 30,791.40, 42,491.20 and 17,179.80

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Solution

The fourth proportional to 30,791.40, 42,491.20 and 17,179.80 is: 23,707.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,791.40 : 42,491.20 = 17,179.80 : x
  2. Step 2: Convert to fraction form
    30,791.40/42,491.20 = 17,179.80/x
  3. Step 3: Cross multiply
    30,791.40x = 42,491.20 × 17,179.80
  4. Step 4: Simplify right side
    30,791.40x = 729,990,317.76
  5. Step 5: Solve for x
    x = 729,990,317.76/30,791.40
  6. Step 6: Final answer
    x = 23,707.60

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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.