Home / 19,870.43-27,421.28-11,912.64

Finding the Fourth Proportional to 19,870.43, 27,421.28 and 11,912.64

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Solution

The fourth proportional to 19,870.43, 27,421.28 and 11,912.64 is: 16,439.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,870.43 : 27,421.28 = 11,912.64 : x
  2. Step 2: Convert to fraction form
    19,870.43/27,421.28 = 11,912.64/x
  3. Step 3: Cross multiply
    19,870.43x = 27,421.28 × 11,912.64
  4. Step 4: Simplify right side
    19,870.43x = 326,659,777.42
  5. Step 5: Solve for x
    x = 326,659,777.42/19,870.43
  6. Step 6: Final answer
    x = 16,439.50

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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.