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Finding the Fourth Proportional to 386.27, 533.07 and 320.66

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Solution

The fourth proportional to 386.27, 533.07 and 320.66 is: 442.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.27 : 533.07 = 320.66 : x
  2. Step 2: Convert to fraction form
    386.27/533.07 = 320.66/x
  3. Step 3: Cross multiply
    386.27x = 533.07 × 320.66
  4. Step 4: Simplify right side
    386.27x = 170,931.56
  5. Step 5: Solve for x
    x = 170,931.56/386.27
  6. Step 6: Final answer
    x = 442.52

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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.