Home / 30,990.89-42,768.45-18,241.76

Finding the Fourth Proportional to 30,990.89, 42,768.45 and 18,241.76

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Solution

The fourth proportional to 30,990.89, 42,768.45 and 18,241.76 is: 25,174.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,990.89 : 42,768.45 = 18,241.76 : x
  2. Step 2: Convert to fraction form
    30,990.89/42,768.45 = 18,241.76/x
  3. Step 3: Cross multiply
    30,990.89x = 42,768.45 × 18,241.76
  4. Step 4: Simplify right side
    30,990.89x = 780,171,586.63
  5. Step 5: Solve for x
    x = 780,171,586.63/30,990.89
  6. Step 6: Final answer
    x = 25,174.23

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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.