Home / 20,920.14-31,392.36-6,890.40

Finding the Fourth Proportional to 20,920.14, 31,392.36 and 6,890.40

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Solution

The fourth proportional to 20,920.14, 31,392.36 and 6,890.40 is: 10,339.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.14 : 31,392.36 = 6,890.40 : x
  2. Step 2: Convert to fraction form
    20,920.14/31,392.36 = 6,890.40/x
  3. Step 3: Cross multiply
    20,920.14x = 31,392.36 × 6,890.40
  4. Step 4: Simplify right side
    20,920.14x = 216,305,917.34
  5. Step 5: Solve for x
    x = 216,305,917.34/20,920.14
  6. Step 6: Final answer
    x = 10,339.60

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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.