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Finding the Fourth Proportional to 709.92, 979.20 and 554.40

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Solution

The fourth proportional to 709.92, 979.20 and 554.40 is: 764.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.92 : 979.20 = 554.40 : x
  2. Step 2: Convert to fraction form
    709.92/979.20 = 554.40/x
  3. Step 3: Cross multiply
    709.92x = 979.20 × 554.40
  4. Step 4: Simplify right side
    709.92x = 542,868.48
  5. Step 5: Solve for x
    x = 542,868.48/709.92
  6. Step 6: Final answer
    x = 764.69

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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.