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Finding the Fourth Proportional to 554.82, 765.65 and 306.15

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Solution

The fourth proportional to 554.82, 765.65 and 306.15 is: 422.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.82 : 765.65 = 306.15 : x
  2. Step 2: Convert to fraction form
    554.82/765.65 = 306.15/x
  3. Step 3: Cross multiply
    554.82x = 765.65 × 306.15
  4. Step 4: Simplify right side
    554.82x = 234,408.10
  5. Step 5: Solve for x
    x = 234,408.10/554.82
  6. Step 6: Final answer
    x = 422.49

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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.