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Finding the Fourth Proportional to 554.50, 765.30 and 321.76

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Solution

The fourth proportional to 554.50, 765.30 and 321.76 is: 444.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.50 : 765.30 = 321.76 : x
  2. Step 2: Convert to fraction form
    554.50/765.30 = 321.76/x
  3. Step 3: Cross multiply
    554.50x = 765.30 × 321.76
  4. Step 4: Simplify right side
    554.50x = 246,242.93
  5. Step 5: Solve for x
    x = 246,242.93/554.50
  6. Step 6: Final answer
    x = 444.08

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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.