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Finding the Fourth Proportional to 20,952.76, 28,961.04 and 18,415.84

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Solution

The fourth proportional to 20,952.76, 28,961.04 and 18,415.84 is: 25,454.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,952.76 : 28,961.04 = 18,415.84 : x
  2. Step 2: Convert to fraction form
    20,952.76/28,961.04 = 18,415.84/x
  3. Step 3: Cross multiply
    20,952.76x = 28,961.04 × 18,415.84
  4. Step 4: Simplify right side
    20,952.76x = 533,341,878.87
  5. Step 5: Solve for x
    x = 533,341,878.87/20,952.76
  6. Step 6: Final answer
    x = 25,454.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.