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Finding the Fourth Proportional to 13,985.40, 20,978.38 and 5,218.57

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Solution

The fourth proportional to 13,985.40, 20,978.38 and 5,218.57 is: 7,827.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,985.40 : 20,978.38 = 5,218.57 : x
  2. Step 2: Convert to fraction form
    13,985.40/20,978.38 = 5,218.57/x
  3. Step 3: Cross multiply
    13,985.40x = 20,978.38 × 5,218.57
  4. Step 4: Simplify right side
    13,985.40x = 109,477,039.62
  5. Step 5: Solve for x
    x = 109,477,039.62/13,985.40
  6. Step 6: Final answer
    x = 7,827.95

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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.