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Finding the Fourth Proportional to 812,129.76, 1,218,311.28 and 251,208

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Solution

The fourth proportional to 812,129.76, 1,218,311.28 and 251,208 is: 376,848.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    812,129.76 : 1,218,311.28 = 251,208 : x
  2. Step 2: Convert to fraction form
    812,129.76/1,218,311.28 = 251,208/x
  3. Step 3: Cross multiply
    812,129.76x = 1,218,311.28 × 251,208
  4. Step 4: Simplify right side
    812,129.76x = 306,049,540,026.24
  5. Step 5: Solve for x
    x = 306,049,540,026.24/812,129.76
  6. Step 6: Final answer
    x = 376,848.08

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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.