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Finding the Fourth Proportional to 19,791.92, 29,619.12 and 12,292.40

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Solution

The fourth proportional to 19,791.92, 29,619.12 and 12,292.40 is: 18,395.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,791.92 : 29,619.12 = 12,292.40 : x
  2. Step 2: Convert to fraction form
    19,791.92/29,619.12 = 12,292.40/x
  3. Step 3: Cross multiply
    19,791.92x = 29,619.12 × 12,292.40
  4. Step 4: Simplify right side
    19,791.92x = 364,090,070.69
  5. Step 5: Solve for x
    x = 364,090,070.69/19,791.92
  6. Step 6: Final answer
    x = 18,395.89

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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.