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Finding the Fourth Proportional to 554.40, 765.10 and 305.72

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Solution

The fourth proportional to 554.40, 765.10 and 305.72 is: 421.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.40 : 765.10 = 305.72 : x
  2. Step 2: Convert to fraction form
    554.40/765.10 = 305.72/x
  3. Step 3: Cross multiply
    554.40x = 765.10 × 305.72
  4. Step 4: Simplify right side
    554.40x = 233,906.37
  5. Step 5: Solve for x
    x = 233,906.37/554.40
  6. Step 6: Final answer
    x = 421.91

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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.