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Finding the Fourth Proportional to 320.11, 480.31 and 135.06

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Solution

The fourth proportional to 320.11, 480.31 and 135.06 is: 202.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.11 : 480.31 = 135.06 : x
  2. Step 2: Convert to fraction form
    320.11/480.31 = 135.06/x
  3. Step 3: Cross multiply
    320.11x = 480.31 × 135.06
  4. Step 4: Simplify right side
    320.11x = 64,870.67
  5. Step 5: Solve for x
    x = 64,870.67/320.11
  6. Step 6: Final answer
    x = 202.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.