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Finding the Fourth Proportional to 330.36, 492.78 and 307.68

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Solution

The fourth proportional to 330.36, 492.78 and 307.68 is: 458.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.36 : 492.78 = 307.68 : x
  2. Step 2: Convert to fraction form
    330.36/492.78 = 307.68/x
  3. Step 3: Cross multiply
    330.36x = 492.78 × 307.68
  4. Step 4: Simplify right side
    330.36x = 151,618.55
  5. Step 5: Solve for x
    x = 151,618.55/330.36
  6. Step 6: Final answer
    x = 458.95

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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.