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Finding the Fourth Proportional to 709.46, 978.73 and 429.65

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Solution

The fourth proportional to 709.46, 978.73 and 429.65 is: 592.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.46 : 978.73 = 429.65 : x
  2. Step 2: Convert to fraction form
    709.46/978.73 = 429.65/x
  3. Step 3: Cross multiply
    709.46x = 978.73 × 429.65
  4. Step 4: Simplify right side
    709.46x = 420,516.97
  5. Step 5: Solve for x
    x = 420,516.97/709.46
  6. Step 6: Final answer
    x = 592.73

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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.