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Finding the Fourth Proportional to 330.76, 455.62 and 315.08

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Solution

The fourth proportional to 330.76, 455.62 and 315.08 is: 434.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.76 : 455.62 = 315.08 : x
  2. Step 2: Convert to fraction form
    330.76/455.62 = 315.08/x
  3. Step 3: Cross multiply
    330.76x = 455.62 × 315.08
  4. Step 4: Simplify right side
    330.76x = 143,556.75
  5. Step 5: Solve for x
    x = 143,556.75/330.76
  6. Step 6: Final answer
    x = 434.02

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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.