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Finding the Fourth Proportional to 478.51, 660.56 and 321.17

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Solution

The fourth proportional to 478.51, 660.56 and 321.17 is: 443.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.51 : 660.56 = 321.17 : x
  2. Step 2: Convert to fraction form
    478.51/660.56 = 321.17/x
  3. Step 3: Cross multiply
    478.51x = 660.56 × 321.17
  4. Step 4: Simplify right side
    478.51x = 212,147.15
  5. Step 5: Solve for x
    x = 212,147.15/478.51
  6. Step 6: Final answer
    x = 443.35

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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.