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Finding the Fourth Proportional to 13,291, 19,948.80 and 6,721.80

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Solution

The fourth proportional to 13,291, 19,948.80 and 6,721.80 is: 10,088.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,291 : 19,948.80 = 6,721.80 : x
  2. Step 2: Convert to fraction form
    13,291/19,948.80 = 6,721.80/x
  3. Step 3: Cross multiply
    13,291x = 19,948.80 × 6,721.80
  4. Step 4: Simplify right side
    13,291x = 134,091,843.84
  5. Step 5: Solve for x
    x = 134,091,843.84/13,291
  6. Step 6: Final answer
    x = 10,088.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.