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Finding the Fourth Proportional to 66,145.92, 99,225.44 and 21,155.97

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Solution

The fourth proportional to 66,145.92, 99,225.44 and 21,155.97 is: 31,736.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,145.92 : 99,225.44 = 21,155.97 : x
  2. Step 2: Convert to fraction form
    66,145.92/99,225.44 = 21,155.97/x
  3. Step 3: Cross multiply
    66,145.92x = 99,225.44 × 21,155.97
  4. Step 4: Simplify right side
    66,145.92x = 2,099,210,326.10
  5. Step 5: Solve for x
    x = 2,099,210,326.10/66,145.92
  6. Step 6: Final answer
    x = 31,736.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.