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Finding the Fourth Proportional to 124,992.72, 172,463.28 and 74,021.46

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Solution

The fourth proportional to 124,992.72, 172,463.28 and 74,021.46 is: 102,133.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,992.72 : 172,463.28 = 74,021.46 : x
  2. Step 2: Convert to fraction form
    124,992.72/172,463.28 = 74,021.46/x
  3. Step 3: Cross multiply
    124,992.72x = 172,463.28 × 74,021.46
  4. Step 4: Simplify right side
    124,992.72x = 12,765,983,781.99
  5. Step 5: Solve for x
    x = 12,765,983,781.99/124,992.72
  6. Step 6: Final answer
    x = 102,133.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.