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Finding the Fourth Proportional to 1,252.84, 1,878.98 and 431.14

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Solution

The fourth proportional to 1,252.84, 1,878.98 and 431.14 is: 646.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.84 : 1,878.98 = 431.14 : x
  2. Step 2: Convert to fraction form
    1,252.84/1,878.98 = 431.14/x
  3. Step 3: Cross multiply
    1,252.84x = 1,878.98 × 431.14
  4. Step 4: Simplify right side
    1,252.84x = 810,103.44
  5. Step 5: Solve for x
    x = 810,103.44/1,252.84
  6. Step 6: Final answer
    x = 646.61

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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.