Home / 20,878.12-28,812.96-12,385.28

Finding the Fourth Proportional to 20,878.12, 28,812.96 and 12,385.28

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Solution

The fourth proportional to 20,878.12, 28,812.96 and 12,385.28 is: 17,092.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.12 : 28,812.96 = 12,385.28 : x
  2. Step 2: Convert to fraction form
    20,878.12/28,812.96 = 12,385.28/x
  3. Step 3: Cross multiply
    20,878.12x = 28,812.96 × 12,385.28
  4. Step 4: Simplify right side
    20,878.12x = 356,856,577.23
  5. Step 5: Solve for x
    x = 356,856,577.23/20,878.12
  6. Step 6: Final answer
    x = 17,092.37

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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.