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Finding the Fourth Proportional to 554.71, 765.48 and 321.79

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Solution

The fourth proportional to 554.71, 765.48 and 321.79 is: 444.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.71 : 765.48 = 321.79 : x
  2. Step 2: Convert to fraction form
    554.71/765.48 = 321.79/x
  3. Step 3: Cross multiply
    554.71x = 765.48 × 321.79
  4. Step 4: Simplify right side
    554.71x = 246,323.81
  5. Step 5: Solve for x
    x = 246,323.81/554.71
  6. Step 6: Final answer
    x = 444.06

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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.