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Finding the Fourth Proportional to 709.57, 978.86 and 611.16

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Solution

The fourth proportional to 709.57, 978.86 and 611.16 is: 843.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.57 : 978.86 = 611.16 : x
  2. Step 2: Convert to fraction form
    709.57/978.86 = 611.16/x
  3. Step 3: Cross multiply
    709.57x = 978.86 × 611.16
  4. Step 4: Simplify right side
    709.57x = 598,237.93
  5. Step 5: Solve for x
    x = 598,237.93/709.57
  6. Step 6: Final answer
    x = 843.10

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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.