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Finding the Fourth Proportional to 554.31, 765.18 and 388.53

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Solution

The fourth proportional to 554.31, 765.18 and 388.53 is: 536.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.31 : 765.18 = 388.53 : x
  2. Step 2: Convert to fraction form
    554.31/765.18 = 388.53/x
  3. Step 3: Cross multiply
    554.31x = 765.18 × 388.53
  4. Step 4: Simplify right side
    554.31x = 297,295.39
  5. Step 5: Solve for x
    x = 297,295.39/554.31
  6. Step 6: Final answer
    x = 536.33

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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.