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Finding the Fourth Proportional to 636,372.21, 878,211.93 and 388,028.72

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Solution

The fourth proportional to 636,372.21, 878,211.93 and 388,028.72 is: 535,490.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,372.21 : 878,211.93 = 388,028.72 : x
  2. Step 2: Convert to fraction form
    636,372.21/878,211.93 = 388,028.72/x
  3. Step 3: Cross multiply
    636,372.21x = 878,211.93 × 388,028.72
  4. Step 4: Simplify right side
    636,372.21x = 340,771,452,554.61
  5. Step 5: Solve for x
    x = 340,771,452,554.61/636,372.21
  6. Step 6: Final answer
    x = 535,490.78

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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.