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Finding the Fourth Proportional to 30,963.54, 42,747.39 and 20,383.93

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Solution

The fourth proportional to 30,963.54, 42,747.39 and 20,383.93 is: 28,141.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,963.54 : 42,747.39 = 20,383.93 : x
  2. Step 2: Convert to fraction form
    30,963.54/42,747.39 = 20,383.93/x
  3. Step 3: Cross multiply
    30,963.54x = 42,747.39 × 20,383.93
  4. Step 4: Simplify right side
    30,963.54x = 871,359,698.57
  5. Step 5: Solve for x
    x = 871,359,698.57/30,963.54
  6. Step 6: Final answer
    x = 28,141.48

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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.