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Finding the Fourth Proportional to 554.45, 765.15 and 355.39

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Solution

The fourth proportional to 554.45, 765.15 and 355.39 is: 490.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.45 : 765.15 = 355.39 : x
  2. Step 2: Convert to fraction form
    554.45/765.15 = 355.39/x
  3. Step 3: Cross multiply
    554.45x = 765.15 × 355.39
  4. Step 4: Simplify right side
    554.45x = 271,923.41
  5. Step 5: Solve for x
    x = 271,923.41/554.45
  6. Step 6: Final answer
    x = 490.44

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1.5x scale

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.