Home / 21,318.85-31,820.39-20,005.57

Finding the Fourth Proportional to 21,318.85, 31,820.39 and 20,005.57

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Solution

The fourth proportional to 21,318.85, 31,820.39 and 20,005.57 is: 29,860.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,318.85 : 31,820.39 = 20,005.57 : x
  2. Step 2: Convert to fraction form
    21,318.85/31,820.39 = 20,005.57/x
  3. Step 3: Cross multiply
    21,318.85x = 31,820.39 × 20,005.57
  4. Step 4: Simplify right side
    21,318.85x = 636,585,039.57
  5. Step 5: Solve for x
    x = 636,585,039.57/21,318.85
  6. Step 6: Final answer
    x = 29,860.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.