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Finding the Fourth Proportional to 709.79, 979.51 and 395.08

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Solution

The fourth proportional to 709.79, 979.51 and 395.08 is: 545.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.79 : 979.51 = 395.08 : x
  2. Step 2: Convert to fraction form
    709.79/979.51 = 395.08/x
  3. Step 3: Cross multiply
    709.79x = 979.51 × 395.08
  4. Step 4: Simplify right side
    709.79x = 386,984.81
  5. Step 5: Solve for x
    x = 386,984.81/709.79
  6. Step 6: Final answer
    x = 545.21

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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.