Home / 21,942.72-30,281.40-12,990.06

Finding the Fourth Proportional to 21,942.72, 30,281.40 and 12,990.06

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Solution

The fourth proportional to 21,942.72, 30,281.40 and 12,990.06 is: 17,926.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,942.72 : 30,281.40 = 12,990.06 : x
  2. Step 2: Convert to fraction form
    21,942.72/30,281.40 = 12,990.06/x
  3. Step 3: Cross multiply
    21,942.72x = 30,281.40 × 12,990.06
  4. Step 4: Simplify right side
    21,942.72x = 393,357,202.88
  5. Step 5: Solve for x
    x = 393,357,202.88/21,942.72
  6. Step 6: Final answer
    x = 17,926.55

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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.