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Finding the Fourth Proportional to 171,547.28, 257,408.64 and 81,691.52

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Solution

The fourth proportional to 171,547.28, 257,408.64 and 81,691.52 is: 122,579.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,547.28 : 257,408.64 = 81,691.52 : x
  2. Step 2: Convert to fraction form
    171,547.28/257,408.64 = 81,691.52/x
  3. Step 3: Cross multiply
    171,547.28x = 257,408.64 × 81,691.52
  4. Step 4: Simplify right side
    171,547.28x = 21,028,103,062.73
  5. Step 5: Solve for x
    x = 21,028,103,062.73/171,547.28
  6. Step 6: Final answer
    x = 122,579.05

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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.