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Finding the Fourth Proportional to 554.74, 764.24 and 388.66

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Solution

The fourth proportional to 554.74, 764.24 and 388.66 is: 535.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.74 : 764.24 = 388.66 : x
  2. Step 2: Convert to fraction form
    554.74/764.24 = 388.66/x
  3. Step 3: Cross multiply
    554.74x = 764.24 × 388.66
  4. Step 4: Simplify right side
    554.74x = 297,029.52
  5. Step 5: Solve for x
    x = 297,029.52/554.74
  6. Step 6: Final answer
    x = 535.44

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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.