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Finding the Fourth Proportional to 554.60, 765.09 and 355.70

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Solution

The fourth proportional to 554.60, 765.09 and 355.70 is: 490.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.60 : 765.09 = 355.70 : x
  2. Step 2: Convert to fraction form
    554.60/765.09 = 355.70/x
  3. Step 3: Cross multiply
    554.60x = 765.09 × 355.70
  4. Step 4: Simplify right side
    554.60x = 272,142.51
  5. Step 5: Solve for x
    x = 272,142.51/554.60
  6. Step 6: Final answer
    x = 490.70

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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.