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Finding the Fourth Proportional to 18,375.90, 25,358.04 and 9,992.40

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Solution

The fourth proportional to 18,375.90, 25,358.04 and 9,992.40 is: 13,789.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,375.90 : 25,358.04 = 9,992.40 : x
  2. Step 2: Convert to fraction form
    18,375.90/25,358.04 = 9,992.40/x
  3. Step 3: Cross multiply
    18,375.90x = 25,358.04 × 9,992.40
  4. Step 4: Simplify right side
    18,375.90x = 253,387,678.90
  5. Step 5: Solve for x
    x = 253,387,678.90/18,375.90
  6. Step 6: Final answer
    x = 13,789.13

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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.