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Finding the Fourth Proportional to 554.39, 765.05 and 305.72

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Solution

The fourth proportional to 554.39, 765.05 and 305.72 is: 421.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.39 : 765.05 = 305.72 : x
  2. Step 2: Convert to fraction form
    554.39/765.05 = 305.72/x
  3. Step 3: Cross multiply
    554.39x = 765.05 × 305.72
  4. Step 4: Simplify right side
    554.39x = 233,888.60
  5. Step 5: Solve for x
    x = 233,888.60/554.39
  6. Step 6: Final answer
    x = 421.89

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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.