Home / 20,121.65-30,178.20-7,637.30

Finding the Fourth Proportional to 20,121.65, 30,178.20 and 7,637.30

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Solution

The fourth proportional to 20,121.65, 30,178.20 and 7,637.30 is: 11,454.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,121.65 : 30,178.20 = 7,637.30 : x
  2. Step 2: Convert to fraction form
    20,121.65/30,178.20 = 7,637.30/x
  3. Step 3: Cross multiply
    20,121.65x = 30,178.20 × 7,637.30
  4. Step 4: Simplify right side
    20,121.65x = 230,479,966.86
  5. Step 5: Solve for x
    x = 230,479,966.86/20,121.65
  6. Step 6: Final answer
    x = 11,454.33

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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.