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Finding the Fourth Proportional to 554.55, 764.59 and 421.96

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Solution

The fourth proportional to 554.55, 764.59 and 421.96 is: 581.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.55 : 764.59 = 421.96 : x
  2. Step 2: Convert to fraction form
    554.55/764.59 = 421.96/x
  3. Step 3: Cross multiply
    554.55x = 764.59 × 421.96
  4. Step 4: Simplify right side
    554.55x = 322,625.65
  5. Step 5: Solve for x
    x = 322,625.65/554.55
  6. Step 6: Final answer
    x = 581.78

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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.