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Finding the Fourth Proportional to 330.78, 455.52 and 315.19

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Solution

The fourth proportional to 330.78, 455.52 and 315.19 is: 434.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.78 : 455.52 = 315.19 : x
  2. Step 2: Convert to fraction form
    330.78/455.52 = 315.19/x
  3. Step 3: Cross multiply
    330.78x = 455.52 × 315.19
  4. Step 4: Simplify right side
    330.78x = 143,577.10
  5. Step 5: Solve for x
    x = 143,577.10/330.78
  6. Step 6: Final answer
    x = 434.05

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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.