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Finding the Fourth Proportional to 554.46, 765.31 and 388.71

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Solution

The fourth proportional to 554.46, 765.31 and 388.71 is: 536.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.46 : 765.31 = 388.71 : x
  2. Step 2: Convert to fraction form
    554.46/765.31 = 388.71/x
  3. Step 3: Cross multiply
    554.46x = 765.31 × 388.71
  4. Step 4: Simplify right side
    554.46x = 297,483.41
  5. Step 5: Solve for x
    x = 297,483.41/554.46
  6. Step 6: Final answer
    x = 536.53

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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.