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Finding the Fourth Proportional to 330.51, 455.07 and 280.62

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Solution

The fourth proportional to 330.51, 455.07 and 280.62 is: 386.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.51 : 455.07 = 280.62 : x
  2. Step 2: Convert to fraction form
    330.51/455.07 = 280.62/x
  3. Step 3: Cross multiply
    330.51x = 455.07 × 280.62
  4. Step 4: Simplify right side
    330.51x = 127,699.34
  5. Step 5: Solve for x
    x = 127,699.34/330.51
  6. Step 6: Final answer
    x = 386.37

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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.