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Finding the Fourth Proportional to 20,876.58, 28,815.21 and 12,914.28

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Solution

The fourth proportional to 20,876.58, 28,815.21 and 12,914.28 is: 17,825.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,876.58 : 28,815.21 = 12,914.28 : x
  2. Step 2: Convert to fraction form
    20,876.58/28,815.21 = 12,914.28/x
  3. Step 3: Cross multiply
    20,876.58x = 28,815.21 × 12,914.28
  4. Step 4: Simplify right side
    20,876.58x = 372,127,690.20
  5. Step 5: Solve for x
    x = 372,127,690.20/20,876.58
  6. Step 6: Final answer
    x = 17,825.13

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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.