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Finding the Fourth Proportional to 13,319.15, 19,978.72 and 3,959.13

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Solution

The fourth proportional to 13,319.15, 19,978.72 and 3,959.13 is: 5,938.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,319.15 : 19,978.72 = 3,959.13 : x
  2. Step 2: Convert to fraction form
    13,319.15/19,978.72 = 3,959.13/x
  3. Step 3: Cross multiply
    13,319.15x = 19,978.72 × 3,959.13
  4. Step 4: Simplify right side
    13,319.15x = 79,098,349.71
  5. Step 5: Solve for x
    x = 79,098,349.71/13,319.15
  6. Step 6: Final answer
    x = 5,938.69

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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.