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Finding the Fourth Proportional to 320.32, 477.92 and 266.56

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Solution

The fourth proportional to 320.32, 477.92 and 266.56 is: 397.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.32 : 477.92 = 266.56 : x
  2. Step 2: Convert to fraction form
    320.32/477.92 = 266.56/x
  3. Step 3: Cross multiply
    320.32x = 477.92 × 266.56
  4. Step 4: Simplify right side
    320.32x = 127,394.36
  5. Step 5: Solve for x
    x = 127,394.36/320.32
  6. Step 6: Final answer
    x = 397.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.