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Finding the Fourth Proportional to 709.13, 978.61 and 616.18

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Solution

The fourth proportional to 709.13, 978.61 and 616.18 is: 850.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.13 : 978.61 = 616.18 : x
  2. Step 2: Convert to fraction form
    709.13/978.61 = 616.18/x
  3. Step 3: Cross multiply
    709.13x = 978.61 × 616.18
  4. Step 4: Simplify right side
    709.13x = 602,999.91
  5. Step 5: Solve for x
    x = 602,999.91/709.13
  6. Step 6: Final answer
    x = 850.34

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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.