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Finding the Fourth Proportional to 171,812.72, 257,631.60 and 66,661.76

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Solution

The fourth proportional to 171,812.72, 257,631.60 and 66,661.76 is: 99,958.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,812.72 : 257,631.60 = 66,661.76 : x
  2. Step 2: Convert to fraction form
    171,812.72/257,631.60 = 66,661.76/x
  3. Step 3: Cross multiply
    171,812.72x = 257,631.60 × 66,661.76
  4. Step 4: Simplify right side
    171,812.72x = 17,174,175,887.62
  5. Step 5: Solve for x
    x = 17,174,175,887.62/171,812.72
  6. Step 6: Final answer
    x = 99,958.70

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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.