Home / 20,679.30-30,989.79-13,272.66

Finding the Fourth Proportional to 20,679.30, 30,989.79 and 13,272.66

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Solution

The fourth proportional to 20,679.30, 30,989.79 and 13,272.66 is: 19,890.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,679.30 : 30,989.79 = 13,272.66 : x
  2. Step 2: Convert to fraction form
    20,679.30/30,989.79 = 13,272.66/x
  3. Step 3: Cross multiply
    20,679.30x = 30,989.79 × 13,272.66
  4. Step 4: Simplify right side
    20,679.30x = 411,316,946.14
  5. Step 5: Solve for x
    x = 411,316,946.14/20,679.30
  6. Step 6: Final answer
    x = 19,890.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.