Home / 20,878.89-28,813.10-11,447.25

Finding the Fourth Proportional to 20,878.89, 28,813.10 and 11,447.25

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Solution

The fourth proportional to 20,878.89, 28,813.10 and 11,447.25 is: 15,797.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.89 : 28,813.10 = 11,447.25 : x
  2. Step 2: Convert to fraction form
    20,878.89/28,813.10 = 11,447.25/x
  3. Step 3: Cross multiply
    20,878.89x = 28,813.10 × 11,447.25
  4. Step 4: Simplify right side
    20,878.89x = 329,830,701.74
  5. Step 5: Solve for x
    x = 329,830,701.74/20,878.89
  6. Step 6: Final answer
    x = 15,797.33

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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.