Home / 20,813.05-28,721.56-11,381.60

Finding the Fourth Proportional to 20,813.05, 28,721.56 and 11,381.60

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Solution

The fourth proportional to 20,813.05, 28,721.56 and 11,381.60 is: 15,706.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,813.05 : 28,721.56 = 11,381.60 : x
  2. Step 2: Convert to fraction form
    20,813.05/28,721.56 = 11,381.60/x
  3. Step 3: Cross multiply
    20,813.05x = 28,721.56 × 11,381.60
  4. Step 4: Simplify right side
    20,813.05x = 326,897,307.30
  5. Step 5: Solve for x
    x = 326,897,307.30/20,813.05
  6. Step 6: Final answer
    x = 15,706.36

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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.