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Finding the Fourth Proportional to 15,720.76, 21,692.26 and 8,914.41

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Solution

The fourth proportional to 15,720.76, 21,692.26 and 8,914.41 is: 12,300.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,720.76 : 21,692.26 = 8,914.41 : x
  2. Step 2: Convert to fraction form
    15,720.76/21,692.26 = 8,914.41/x
  3. Step 3: Cross multiply
    15,720.76x = 21,692.26 × 8,914.41
  4. Step 4: Simplify right side
    15,720.76x = 193,373,591.01
  5. Step 5: Solve for x
    x = 193,373,591.01/15,720.76
  6. Step 6: Final answer
    x = 12,300.52

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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.