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Finding the Fourth Proportional to 12,897.44, 19,239.40 and 12,728.48

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Solution

The fourth proportional to 12,897.44, 19,239.40 and 12,728.48 is: 18,987.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,897.44 : 19,239.40 = 12,728.48 : x
  2. Step 2: Convert to fraction form
    12,897.44/19,239.40 = 12,728.48/x
  3. Step 3: Cross multiply
    12,897.44x = 19,239.40 × 12,728.48
  4. Step 4: Simplify right side
    12,897.44x = 244,888,318.11
  5. Step 5: Solve for x
    x = 244,888,318.11/12,897.44
  6. Step 6: Final answer
    x = 18,987.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.