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Finding the Fourth Proportional to 491,356.64, 678,017.21 and 276,570.56

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Solution

The fourth proportional to 491,356.64, 678,017.21 and 276,570.56 is: 381,636.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,356.64 : 678,017.21 = 276,570.56 : x
  2. Step 2: Convert to fraction form
    491,356.64/678,017.21 = 276,570.56/x
  3. Step 3: Cross multiply
    491,356.64x = 678,017.21 × 276,570.56
  4. Step 4: Simplify right side
    491,356.64x = 187,519,599,771.53
  5. Step 5: Solve for x
    x = 187,519,599,771.53/491,356.64
  6. Step 6: Final answer
    x = 381,636.44

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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.