Home / 20,920.35-31,381.53-6,880.07

Finding the Fourth Proportional to 20,920.35, 31,381.53 and 6,880.07

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Solution

The fourth proportional to 20,920.35, 31,381.53 and 6,880.07 is: 10,320.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.35 : 31,381.53 = 6,880.07 : x
  2. Step 2: Convert to fraction form
    20,920.35/31,381.53 = 6,880.07/x
  3. Step 3: Cross multiply
    20,920.35x = 31,381.53 × 6,880.07
  4. Step 4: Simplify right side
    20,920.35x = 215,906,966.20
  5. Step 5: Solve for x
    x = 215,906,966.20/20,920.35
  6. Step 6: Final answer
    x = 10,320.43

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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.