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Finding the Fourth Proportional to 19,721.90, 27,200.79 and 12,648.98

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Solution

The fourth proportional to 19,721.90, 27,200.79 and 12,648.98 is: 17,445.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,721.90 : 27,200.79 = 12,648.98 : x
  2. Step 2: Convert to fraction form
    19,721.90/27,200.79 = 12,648.98/x
  3. Step 3: Cross multiply
    19,721.90x = 27,200.79 × 12,648.98
  4. Step 4: Simplify right side
    19,721.90x = 344,062,112.69
  5. Step 5: Solve for x
    x = 344,062,112.69/19,721.90
  6. Step 6: Final answer
    x = 17,445.69

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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.