Home / 20,478.55-30,717.79-6,439.81

Finding the Fourth Proportional to 20,478.55, 30,717.79 and 6,439.81

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Solution

The fourth proportional to 20,478.55, 30,717.79 and 6,439.81 is: 9,659.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,478.55 : 30,717.79 = 6,439.81 : x
  2. Step 2: Convert to fraction form
    20,478.55/30,717.79 = 6,439.81/x
  3. Step 3: Cross multiply
    20,478.55x = 30,717.79 × 6,439.81
  4. Step 4: Simplify right side
    20,478.55x = 197,816,731.22
  5. Step 5: Solve for x
    x = 197,816,731.22/20,478.55
  6. Step 6: Final answer
    x = 9,659.70

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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.