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Finding the Fourth Proportional to 30,698.70, 42,350.42 and 18,759.80

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Solution

The fourth proportional to 30,698.70, 42,350.42 and 18,759.80 is: 25,880.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,698.70 : 42,350.42 = 18,759.80 : x
  2. Step 2: Convert to fraction form
    30,698.70/42,350.42 = 18,759.80/x
  3. Step 3: Cross multiply
    30,698.70x = 42,350.42 × 18,759.80
  4. Step 4: Simplify right side
    30,698.70x = 794,485,409.12
  5. Step 5: Solve for x
    x = 794,485,409.12/30,698.70
  6. Step 6: Final answer
    x = 25,880.10

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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.