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Finding the Fourth Proportional to 920.79, 1,381.24 and 304.55

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Solution

The fourth proportional to 920.79, 1,381.24 and 304.55 is: 456.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.79 : 1,381.24 = 304.55 : x
  2. Step 2: Convert to fraction form
    920.79/1,381.24 = 304.55/x
  3. Step 3: Cross multiply
    920.79x = 1,381.24 × 304.55
  4. Step 4: Simplify right side
    920.79x = 420,655.12
  5. Step 5: Solve for x
    x = 420,655.12/920.79
  6. Step 6: Final answer
    x = 456.84

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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.