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Finding the Fourth Proportional to 13,979, 20,968.50 and 3,590.75

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Solution

The fourth proportional to 13,979, 20,968.50 and 3,590.75 is: 5,386.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,979 : 20,968.50 = 3,590.75 : x
  2. Step 2: Convert to fraction form
    13,979/20,968.50 = 3,590.75/x
  3. Step 3: Cross multiply
    13,979x = 20,968.50 × 3,590.75
  4. Step 4: Simplify right side
    13,979x = 75,292,641.38
  5. Step 5: Solve for x
    x = 75,292,641.38/13,979
  6. Step 6: Final answer
    x = 5,386.13

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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.