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Finding the Fourth Proportional to 667,709.64, 921,419.28 and 381,173.76

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Solution

The fourth proportional to 667,709.64, 921,419.28 and 381,173.76 is: 526,008.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,709.64 : 921,419.28 = 381,173.76 : x
  2. Step 2: Convert to fraction form
    667,709.64/921,419.28 = 381,173.76/x
  3. Step 3: Cross multiply
    667,709.64x = 921,419.28 × 381,173.76
  4. Step 4: Simplify right side
    667,709.64x = 351,220,851,494.09
  5. Step 5: Solve for x
    x = 351,220,851,494.09/667,709.64
  6. Step 6: Final answer
    x = 526,008.36

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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.