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Finding the Fourth Proportional to 554.72, 764.72 and 388.42

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Solution

The fourth proportional to 554.72, 764.72 and 388.42 is: 535.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.72 : 764.72 = 388.42 : x
  2. Step 2: Convert to fraction form
    554.72/764.72 = 388.42/x
  3. Step 3: Cross multiply
    554.72x = 764.72 × 388.42
  4. Step 4: Simplify right side
    554.72x = 297,032.54
  5. Step 5: Solve for x
    x = 297,032.54/554.72
  6. Step 6: Final answer
    x = 535.46

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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.