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Finding the Fourth Proportional to 709.79, 979.53 and 395.08

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Solution

The fourth proportional to 709.79, 979.53 and 395.08 is: 545.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.79 : 979.53 = 395.08 : x
  2. Step 2: Convert to fraction form
    709.79/979.53 = 395.08/x
  3. Step 3: Cross multiply
    709.79x = 979.53 × 395.08
  4. Step 4: Simplify right side
    709.79x = 386,992.71
  5. Step 5: Solve for x
    x = 386,992.71/709.79
  6. Step 6: Final answer
    x = 545.22

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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.