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Finding the Fourth Proportional to 20,877.67, 28,811.28 and 11,317.57

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Solution

The fourth proportional to 20,877.67, 28,811.28 and 11,317.57 is: 15,618.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,877.67 : 28,811.28 = 11,317.57 : x
  2. Step 2: Convert to fraction form
    20,877.67/28,811.28 = 11,317.57/x
  3. Step 3: Cross multiply
    20,877.67x = 28,811.28 × 11,317.57
  4. Step 4: Simplify right side
    20,877.67x = 326,073,678.19
  5. Step 5: Solve for x
    x = 326,073,678.19/20,877.67
  6. Step 6: Final answer
    x = 15,618.30

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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.