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Finding the Fourth Proportional to 709.86, 979.51 and 395.11

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Solution

The fourth proportional to 709.86, 979.51 and 395.11 is: 545.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.86 : 979.51 = 395.11 : x
  2. Step 2: Convert to fraction form
    709.86/979.51 = 395.11/x
  3. Step 3: Cross multiply
    709.86x = 979.51 × 395.11
  4. Step 4: Simplify right side
    709.86x = 387,014.20
  5. Step 5: Solve for x
    x = 387,014.20/709.86
  6. Step 6: Final answer
    x = 545.20

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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.