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Finding the Fourth Proportional to 920.31, 1,380.48 and 304.08

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Solution

The fourth proportional to 920.31, 1,380.48 and 304.08 is: 456.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.31 : 1,380.48 = 304.08 : x
  2. Step 2: Convert to fraction form
    920.31/1,380.48 = 304.08/x
  3. Step 3: Cross multiply
    920.31x = 1,380.48 × 304.08
  4. Step 4: Simplify right side
    920.31x = 419,776.36
  5. Step 5: Solve for x
    x = 419,776.36/920.31
  6. Step 6: Final answer
    x = 456.12

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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.