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Finding the Fourth Proportional to 330.89, 455.59 and 280.99

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Solution

The fourth proportional to 330.89, 455.59 and 280.99 is: 386.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.89 : 455.59 = 280.99 : x
  2. Step 2: Convert to fraction form
    330.89/455.59 = 280.99/x
  3. Step 3: Cross multiply
    330.89x = 455.59 × 280.99
  4. Step 4: Simplify right side
    330.89x = 128,014.83
  5. Step 5: Solve for x
    x = 128,014.83/330.89
  6. Step 6: Final answer
    x = 386.89

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.