Home / 21,909.96-30,225.42-15,939

Finding the Fourth Proportional to 21,909.96, 30,225.42 and 15,939

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Solution

The fourth proportional to 21,909.96, 30,225.42 and 15,939 is: 21,988.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,909.96 : 30,225.42 = 15,939 : x
  2. Step 2: Convert to fraction form
    21,909.96/30,225.42 = 15,939/x
  3. Step 3: Cross multiply
    21,909.96x = 30,225.42 × 15,939
  4. Step 4: Simplify right side
    21,909.96x = 481,762,969.38
  5. Step 5: Solve for x
    x = 481,762,969.38/21,909.96
  6. Step 6: Final answer
    x = 21,988.31

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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.