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Finding the Fourth Proportional to 709.45, 979.23 and 429.70

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Solution

The fourth proportional to 709.45, 979.23 and 429.70 is: 593.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.45 : 979.23 = 429.70 : x
  2. Step 2: Convert to fraction form
    709.45/979.23 = 429.70/x
  3. Step 3: Cross multiply
    709.45x = 979.23 × 429.70
  4. Step 4: Simplify right side
    709.45x = 420,775.13
  5. Step 5: Solve for x
    x = 420,775.13/709.45
  6. Step 6: Final answer
    x = 593.10

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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.