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Finding the Fourth Proportional to 13,902.10, 20,853.15 and 5,135.20

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Solution

The fourth proportional to 13,902.10, 20,853.15 and 5,135.20 is: 7,702.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,902.10 : 20,853.15 = 5,135.20 : x
  2. Step 2: Convert to fraction form
    13,902.10/20,853.15 = 5,135.20/x
  3. Step 3: Cross multiply
    13,902.10x = 20,853.15 × 5,135.20
  4. Step 4: Simplify right side
    13,902.10x = 107,085,095.88
  5. Step 5: Solve for x
    x = 107,085,095.88/13,902.10
  6. Step 6: Final answer
    x = 7,702.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.