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Finding the Fourth Proportional to 20,415.15, 28,175.99 and 12,461.99

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Solution

The fourth proportional to 20,415.15, 28,175.99 and 12,461.99 is: 17,199.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,415.15 : 28,175.99 = 12,461.99 : x
  2. Step 2: Convert to fraction form
    20,415.15/28,175.99 = 12,461.99/x
  3. Step 3: Cross multiply
    20,415.15x = 28,175.99 × 12,461.99
  4. Step 4: Simplify right side
    20,415.15x = 351,128,702.43
  5. Step 5: Solve for x
    x = 351,128,702.43/20,415.15
  6. Step 6: Final answer
    x = 17,199.42

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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.