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Finding the Fourth Proportional to 709.61, 979.28 and 429.99

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Solution

The fourth proportional to 709.61, 979.28 and 429.99 is: 593.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.61 : 979.28 = 429.99 : x
  2. Step 2: Convert to fraction form
    709.61/979.28 = 429.99/x
  3. Step 3: Cross multiply
    709.61x = 979.28 × 429.99
  4. Step 4: Simplify right side
    709.61x = 421,078.46
  5. Step 5: Solve for x
    x = 421,078.46/709.61
  6. Step 6: Final answer
    x = 593.40

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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.