Home / 30,991.56-42,771.96-18,416.30

Finding the Fourth Proportional to 30,991.56, 42,771.96 and 18,416.30

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Solution

The fourth proportional to 30,991.56, 42,771.96 and 18,416.30 is: 25,416.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,991.56 : 42,771.96 = 18,416.30 : x
  2. Step 2: Convert to fraction form
    30,991.56/42,771.96 = 18,416.30/x
  3. Step 3: Cross multiply
    30,991.56x = 42,771.96 × 18,416.30
  4. Step 4: Simplify right side
    30,991.56x = 787,701,246.95
  5. Step 5: Solve for x
    x = 787,701,246.95/30,991.56
  6. Step 6: Final answer
    x = 25,416.64

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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.