Home / 20,982.90-31,474.35-12,672.30

Finding the Fourth Proportional to 20,982.90, 31,474.35 and 12,672.30

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Solution

The fourth proportional to 20,982.90, 31,474.35 and 12,672.30 is: 19,008.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,982.90 : 31,474.35 = 12,672.30 : x
  2. Step 2: Convert to fraction form
    20,982.90/31,474.35 = 12,672.30/x
  3. Step 3: Cross multiply
    20,982.90x = 31,474.35 × 12,672.30
  4. Step 4: Simplify right side
    20,982.90x = 398,852,405.51
  5. Step 5: Solve for x
    x = 398,852,405.51/20,982.90
  6. Step 6: Final answer
    x = 19,008.45

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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.