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Finding the Fourth Proportional to 81,608.96, 112,621.20 and 45,311

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Solution

The fourth proportional to 81,608.96, 112,621.20 and 45,311 is: 62,529.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,608.96 : 112,621.20 = 45,311 : x
  2. Step 2: Convert to fraction form
    81,608.96/112,621.20 = 45,311/x
  3. Step 3: Cross multiply
    81,608.96x = 112,621.20 × 45,311
  4. Step 4: Simplify right side
    81,608.96x = 5,102,979,193.20
  5. Step 5: Solve for x
    x = 5,102,979,193.20/81,608.96
  6. Step 6: Final answer
    x = 62,529.64

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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.