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Finding the Fourth Proportional to 30,078.78, 45,092.79 and 18,960.96

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Solution

The fourth proportional to 30,078.78, 45,092.79 and 18,960.96 is: 28,425.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,078.78 : 45,092.79 = 18,960.96 : x
  2. Step 2: Convert to fraction form
    30,078.78/45,092.79 = 18,960.96/x
  3. Step 3: Cross multiply
    30,078.78x = 45,092.79 × 18,960.96
  4. Step 4: Simplify right side
    30,078.78x = 855,002,587.48
  5. Step 5: Solve for x
    x = 855,002,587.48/30,078.78
  6. Step 6: Final answer
    x = 28,425.45

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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.