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Finding the Fourth Proportional to 15,887.80, 21,898.74 and 11,163.88

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Solution

The fourth proportional to 15,887.80, 21,898.74 and 11,163.88 is: 15,387.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,887.80 : 21,898.74 = 11,163.88 : x
  2. Step 2: Convert to fraction form
    15,887.80/21,898.74 = 11,163.88/x
  3. Step 3: Cross multiply
    15,887.80x = 21,898.74 × 11,163.88
  4. Step 4: Simplify right side
    15,887.80x = 244,474,905.51
  5. Step 5: Solve for x
    x = 244,474,905.51/15,887.80
  6. Step 6: Final answer
    x = 15,387.59

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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.