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Finding the Fourth Proportional to 81,700.78, 122,656.12 and 62,992.70

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Solution

The fourth proportional to 81,700.78, 122,656.12 and 62,992.70 is: 94,569.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,700.78 : 122,656.12 = 62,992.70 : x
  2. Step 2: Convert to fraction form
    81,700.78/122,656.12 = 62,992.70/x
  3. Step 3: Cross multiply
    81,700.78x = 122,656.12 × 62,992.70
  4. Step 4: Simplify right side
    81,700.78x = 7,726,440,170.32
  5. Step 5: Solve for x
    x = 7,726,440,170.32/81,700.78
  6. Step 6: Final answer
    x = 94,569.97

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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.