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Finding the Fourth Proportional to 979.76, 1,351.92 and 554.36

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Solution

The fourth proportional to 979.76, 1,351.92 and 554.36 is: 764.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.76 : 1,351.92 = 554.36 : x
  2. Step 2: Convert to fraction form
    979.76/1,351.92 = 554.36/x
  3. Step 3: Cross multiply
    979.76x = 1,351.92 × 554.36
  4. Step 4: Simplify right side
    979.76x = 749,450.37
  5. Step 5: Solve for x
    x = 749,450.37/979.76
  6. Step 6: Final answer
    x = 764.93

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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.