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Finding the Fourth Proportional to 330.31, 495.47 and 86.84

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Solution

The fourth proportional to 330.31, 495.47 and 86.84 is: 130.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.31 : 495.47 = 86.84 : x
  2. Step 2: Convert to fraction form
    330.31/495.47 = 86.84/x
  3. Step 3: Cross multiply
    330.31x = 495.47 × 86.84
  4. Step 4: Simplify right side
    330.31x = 43,026.61
  5. Step 5: Solve for x
    x = 43,026.61/330.31
  6. Step 6: Final answer
    x = 130.26

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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.