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Finding the Fourth Proportional to 709.11, 978.58 and 429.49

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Solution

The fourth proportional to 709.11, 978.58 and 429.49 is: 592.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.11 : 978.58 = 429.49 : x
  2. Step 2: Convert to fraction form
    709.11/978.58 = 429.49/x
  3. Step 3: Cross multiply
    709.11x = 978.58 × 429.49
  4. Step 4: Simplify right side
    709.11x = 420,290.32
  5. Step 5: Solve for x
    x = 420,290.32/709.11
  6. Step 6: Final answer
    x = 592.70

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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.