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Finding the Fourth Proportional to 20,978.77, 31,468.15 and 17,273.21

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Solution

The fourth proportional to 20,978.77, 31,468.15 and 17,273.21 is: 25,909.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978.77 : 31,468.15 = 17,273.21 : x
  2. Step 2: Convert to fraction form
    20,978.77/31,468.15 = 17,273.21/x
  3. Step 3: Cross multiply
    20,978.77x = 31,468.15 × 17,273.21
  4. Step 4: Simplify right side
    20,978.77x = 543,555,963.26
  5. Step 5: Solve for x
    x = 543,555,963.26/20,978.77
  6. Step 6: Final answer
    x = 25,909.82

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1.5x scale

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.