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Finding the Fourth Proportional to 20,155.80, 27,807.25 and 12,985.17

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Solution

The fourth proportional to 20,155.80, 27,807.25 and 12,985.17 is: 17,914.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,155.80 : 27,807.25 = 12,985.17 : x
  2. Step 2: Convert to fraction form
    20,155.80/27,807.25 = 12,985.17/x
  3. Step 3: Cross multiply
    20,155.80x = 27,807.25 × 12,985.17
  4. Step 4: Simplify right side
    20,155.80x = 361,081,940.30
  5. Step 5: Solve for x
    x = 361,081,940.30/20,155.80
  6. Step 6: Final answer
    x = 17,914.54

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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.