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Finding the Fourth Proportional to 13,978.50, 20,977.47 and 9,035.88

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Solution

The fourth proportional to 13,978.50, 20,977.47 and 9,035.88 is: 13,560.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,978.50 : 20,977.47 = 9,035.88 : x
  2. Step 2: Convert to fraction form
    13,978.50/20,977.47 = 9,035.88/x
  3. Step 3: Cross multiply
    13,978.50x = 20,977.47 × 9,035.88
  4. Step 4: Simplify right side
    13,978.50x = 189,549,751.56
  5. Step 5: Solve for x
    x = 189,549,751.56/13,978.50
  6. Step 6: Final answer
    x = 13,560.10

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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.