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Finding the Fourth Proportional to 30,811.44, 42,520.16 and 18,708.48

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Solution

The fourth proportional to 30,811.44, 42,520.16 and 18,708.48 is: 25,817.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,811.44 : 42,520.16 = 18,708.48 : x
  2. Step 2: Convert to fraction form
    30,811.44/42,520.16 = 18,708.48/x
  3. Step 3: Cross multiply
    30,811.44x = 42,520.16 × 18,708.48
  4. Step 4: Simplify right side
    30,811.44x = 795,487,562.96
  5. Step 5: Solve for x
    x = 795,487,562.96/30,811.44
  6. Step 6: Final answer
    x = 25,817.93

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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.