Home / 20,005.45-30,005.69-12,509.66

Finding the Fourth Proportional to 20,005.45, 30,005.69 and 12,509.66

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Solution

The fourth proportional to 20,005.45, 30,005.69 and 12,509.66 is: 18,762.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,005.45 : 30,005.69 = 12,509.66 : x
  2. Step 2: Convert to fraction form
    20,005.45/30,005.69 = 12,509.66/x
  3. Step 3: Cross multiply
    20,005.45x = 30,005.69 × 12,509.66
  4. Step 4: Simplify right side
    20,005.45x = 375,360,992.43
  5. Step 5: Solve for x
    x = 375,360,992.43/20,005.45
  6. Step 6: Final answer
    x = 18,762.94

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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.