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Finding the Fourth Proportional to 554.72, 765.08 and 388.98

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Solution

The fourth proportional to 554.72, 765.08 and 388.98 is: 536.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.72 : 765.08 = 388.98 : x
  2. Step 2: Convert to fraction form
    554.72/765.08 = 388.98/x
  3. Step 3: Cross multiply
    554.72x = 765.08 × 388.98
  4. Step 4: Simplify right side
    554.72x = 297,600.82
  5. Step 5: Solve for x
    x = 297,600.82/554.72
  6. Step 6: Final answer
    x = 536.49

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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.