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Finding the Fourth Proportional to 15,891.20, 21,928.64 and 9,173.76

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Solution

The fourth proportional to 15,891.20, 21,928.64 and 9,173.76 is: 12,659.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,891.20 : 21,928.64 = 9,173.76 : x
  2. Step 2: Convert to fraction form
    15,891.20/21,928.64 = 9,173.76/x
  3. Step 3: Cross multiply
    15,891.20x = 21,928.64 × 9,173.76
  4. Step 4: Simplify right side
    15,891.20x = 201,168,080.49
  5. Step 5: Solve for x
    x = 201,168,080.49/15,891.20
  6. Step 6: Final answer
    x = 12,659.09

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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.