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Finding the Fourth Proportional to 330.14, 455.15 and 283.31

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Solution

The fourth proportional to 330.14, 455.15 and 283.31 is: 390.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.14 : 455.15 = 283.31 : x
  2. Step 2: Convert to fraction form
    330.14/455.15 = 283.31/x
  3. Step 3: Cross multiply
    330.14x = 455.15 × 283.31
  4. Step 4: Simplify right side
    330.14x = 128,950.39
  5. Step 5: Solve for x
    x = 128,950.39/330.14
  6. Step 6: Final answer
    x = 390.59

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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.