Home / 39,721.40-54,815.36-21,816.35

Finding the Fourth Proportional to 39,721.40, 54,815.36 and 21,816.35

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Solution

The fourth proportional to 39,721.40, 54,815.36 and 21,816.35 is: 30,106.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,721.40 : 54,815.36 = 21,816.35 : x
  2. Step 2: Convert to fraction form
    39,721.40/54,815.36 = 21,816.35/x
  3. Step 3: Cross multiply
    39,721.40x = 54,815.36 × 21,816.35
  4. Step 4: Simplify right side
    39,721.40x = 1,195,870,996.64
  5. Step 5: Solve for x
    x = 1,195,870,996.64/39,721.40
  6. Step 6: Final answer
    x = 30,106.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.