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Finding the Fourth Proportional to 979.61, 1,351.78 and 554.21

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Solution

The fourth proportional to 979.61, 1,351.78 and 554.21 is: 764.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.61 : 1,351.78 = 554.21 : x
  2. Step 2: Convert to fraction form
    979.61/1,351.78 = 554.21/x
  3. Step 3: Cross multiply
    979.61x = 1,351.78 × 554.21
  4. Step 4: Simplify right side
    979.61x = 749,169.99
  5. Step 5: Solve for x
    x = 749,169.99/979.61
  6. Step 6: Final answer
    x = 764.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.