Home / 20,667.80-31,008.90-8,989.40

Finding the Fourth Proportional to 20,667.80, 31,008.90 and 8,989.40

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Solution

The fourth proportional to 20,667.80, 31,008.90 and 8,989.40 is: 13,487.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,667.80 : 31,008.90 = 8,989.40 : x
  2. Step 2: Convert to fraction form
    20,667.80/31,008.90 = 8,989.40/x
  3. Step 3: Cross multiply
    20,667.80x = 31,008.90 × 8,989.40
  4. Step 4: Simplify right side
    20,667.80x = 278,751,405.66
  5. Step 5: Solve for x
    x = 278,751,405.66/20,667.80
  6. Step 6: Final answer
    x = 13,487.23

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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.