Home / 20,946.81-31,435.21-7,619.78

Finding the Fourth Proportional to 20,946.81, 31,435.21 and 7,619.78

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Solution

The fourth proportional to 20,946.81, 31,435.21 and 7,619.78 is: 11,435.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,946.81 : 31,435.21 = 7,619.78 : x
  2. Step 2: Convert to fraction form
    20,946.81/31,435.21 = 7,619.78/x
  3. Step 3: Cross multiply
    20,946.81x = 31,435.21 × 7,619.78
  4. Step 4: Simplify right side
    20,946.81x = 239,529,472.57
  5. Step 5: Solve for x
    x = 239,529,472.57/20,946.81
  6. Step 6: Final answer
    x = 11,435.13

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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.