Home / 28,919.80-39,913.88-20,959.12

Finding the Fourth Proportional to 28,919.80, 39,913.88 and 20,959.12

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Solution

The fourth proportional to 28,919.80, 39,913.88 and 20,959.12 is: 28,926.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,919.80 : 39,913.88 = 20,959.12 : x
  2. Step 2: Convert to fraction form
    28,919.80/39,913.88 = 20,959.12/x
  3. Step 3: Cross multiply
    28,919.80x = 39,913.88 × 20,959.12
  4. Step 4: Simplify right side
    28,919.80x = 836,559,800.59
  5. Step 5: Solve for x
    x = 836,559,800.59/28,919.80
  6. Step 6: Final answer
    x = 28,926.89

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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.