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Finding the Fourth Proportional to 20,700.22, 28,511.88 and 15,911

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Solution

The fourth proportional to 20,700.22, 28,511.88 and 15,911 is: 21,915.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,700.22 : 28,511.88 = 15,911 : x
  2. Step 2: Convert to fraction form
    20,700.22/28,511.88 = 15,911/x
  3. Step 3: Cross multiply
    20,700.22x = 28,511.88 × 15,911
  4. Step 4: Simplify right side
    20,700.22x = 453,652,522.68
  5. Step 5: Solve for x
    x = 453,652,522.68/20,700.22
  6. Step 6: Final answer
    x = 21,915.35

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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.