Home / 20,406.72-30,619.50-9,316.81

Finding the Fourth Proportional to 20,406.72, 30,619.50 and 9,316.81

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Solution

The fourth proportional to 20,406.72, 30,619.50 and 9,316.81 is: 13,979.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,406.72 : 30,619.50 = 9,316.81 : x
  2. Step 2: Convert to fraction form
    20,406.72/30,619.50 = 9,316.81/x
  3. Step 3: Cross multiply
    20,406.72x = 30,619.50 × 9,316.81
  4. Step 4: Simplify right side
    20,406.72x = 285,276,063.80
  5. Step 5: Solve for x
    x = 285,276,063.80/20,406.72
  6. Step 6: Final answer
    x = 13,979.52

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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.