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Finding the Fourth Proportional to 709.08, 978.09 and 447.06

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Solution

The fourth proportional to 709.08, 978.09 and 447.06 is: 616.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.08 : 978.09 = 447.06 : x
  2. Step 2: Convert to fraction form
    709.08/978.09 = 447.06/x
  3. Step 3: Cross multiply
    709.08x = 978.09 × 447.06
  4. Step 4: Simplify right side
    709.08x = 437,264.92
  5. Step 5: Solve for x
    x = 437,264.92/709.08
  6. Step 6: Final answer
    x = 616.67

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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.