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Finding the Fourth Proportional to 15,173.10, 20,921.22 and 11,345.76

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Solution

The fourth proportional to 15,173.10, 20,921.22 and 11,345.76 is: 15,643.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,173.10 : 20,921.22 = 11,345.76 : x
  2. Step 2: Convert to fraction form
    15,173.10/20,921.22 = 11,345.76/x
  3. Step 3: Cross multiply
    15,173.10x = 20,921.22 × 11,345.76
  4. Step 4: Simplify right side
    15,173.10x = 237,367,141.03
  5. Step 5: Solve for x
    x = 237,367,141.03/15,173.10
  6. Step 6: Final answer
    x = 15,643.94

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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.