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Finding the Fourth Proportional to 30,719.79, 42,401.31 and 18,793.11

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Solution

The fourth proportional to 30,719.79, 42,401.31 and 18,793.11 is: 25,939.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,719.79 : 42,401.31 = 18,793.11 : x
  2. Step 2: Convert to fraction form
    30,719.79/42,401.31 = 18,793.11/x
  3. Step 3: Cross multiply
    30,719.79x = 42,401.31 × 18,793.11
  4. Step 4: Simplify right side
    30,719.79x = 796,852,571.50
  5. Step 5: Solve for x
    x = 796,852,571.50/30,719.79
  6. Step 6: Final answer
    x = 25,939.39

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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.