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Finding the Fourth Proportional to 920.88, 1,379.43 and 487.26

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Solution

The fourth proportional to 920.88, 1,379.43 and 487.26 is: 729.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.88 : 1,379.43 = 487.26 : x
  2. Step 2: Convert to fraction form
    920.88/1,379.43 = 487.26/x
  3. Step 3: Cross multiply
    920.88x = 1,379.43 × 487.26
  4. Step 4: Simplify right side
    920.88x = 672,141.06
  5. Step 5: Solve for x
    x = 672,141.06/920.88
  6. Step 6: Final answer
    x = 729.89

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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.