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Finding the Fourth Proportional to 491,438.75, 678,073.28 and 276,500.39

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Solution

The fourth proportional to 491,438.75, 678,073.28 and 276,500.39 is: 381,507.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,438.75 : 678,073.28 = 276,500.39 : x
  2. Step 2: Convert to fraction form
    491,438.75/678,073.28 = 276,500.39/x
  3. Step 3: Cross multiply
    491,438.75x = 678,073.28 × 276,500.39
  4. Step 4: Simplify right side
    491,438.75x = 187,487,521,595.71
  5. Step 5: Solve for x
    x = 187,487,521,595.71/491,438.75
  6. Step 6: Final answer
    x = 381,507.41

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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.