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Finding the Fourth Proportional to 920.63, 1,381.03 and 304.38

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Solution

The fourth proportional to 920.63, 1,381.03 and 304.38 is: 456.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.63 : 1,381.03 = 304.38 : x
  2. Step 2: Convert to fraction form
    920.63/1,381.03 = 304.38/x
  3. Step 3: Cross multiply
    920.63x = 1,381.03 × 304.38
  4. Step 4: Simplify right side
    920.63x = 420,357.15
  5. Step 5: Solve for x
    x = 420,357.15/920.63
  6. Step 6: Final answer
    x = 456.60

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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.