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Finding the Fourth Proportional to 171,920.64, 257,760 and 66,650.88

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Solution

The fourth proportional to 171,920.64, 257,760 and 66,650.88 is: 99,929.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,920.64 : 257,760 = 66,650.88 : x
  2. Step 2: Convert to fraction form
    171,920.64/257,760 = 66,650.88/x
  3. Step 3: Cross multiply
    171,920.64x = 257,760 × 66,650.88
  4. Step 4: Simplify right side
    171,920.64x = 17,179,930,828.80
  5. Step 5: Solve for x
    x = 17,179,930,828.80/171,920.64
  6. Step 6: Final answer
    x = 99,929.43

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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.