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Finding the Fourth Proportional to 19,876.80, 27,424.80 and 12,813.60

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Solution

The fourth proportional to 19,876.80, 27,424.80 and 12,813.60 is: 17,679.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,876.80 : 27,424.80 = 12,813.60 : x
  2. Step 2: Convert to fraction form
    19,876.80/27,424.80 = 12,813.60/x
  3. Step 3: Cross multiply
    19,876.80x = 27,424.80 × 12,813.60
  4. Step 4: Simplify right side
    19,876.80x = 351,410,417.28
  5. Step 5: Solve for x
    x = 351,410,417.28/19,876.80
  6. Step 6: Final answer
    x = 17,679.43

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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.