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Finding the Fourth Proportional to 920.77, 1,379.89 and 487.06

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Solution

The fourth proportional to 920.77, 1,379.89 and 487.06 is: 729.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.77 : 1,379.89 = 487.06 : x
  2. Step 2: Convert to fraction form
    920.77/1,379.89 = 487.06/x
  3. Step 3: Cross multiply
    920.77x = 1,379.89 × 487.06
  4. Step 4: Simplify right side
    920.77x = 672,089.22
  5. Step 5: Solve for x
    x = 672,089.22/920.77
  6. Step 6: Final answer
    x = 729.92

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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.