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Finding the Fourth Proportional to 709.92, 979.67 and 395.19

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Solution

The fourth proportional to 709.92, 979.67 and 395.19 is: 545.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.92 : 979.67 = 395.19 : x
  2. Step 2: Convert to fraction form
    709.92/979.67 = 395.19/x
  3. Step 3: Cross multiply
    709.92x = 979.67 × 395.19
  4. Step 4: Simplify right side
    709.92x = 387,153.81
  5. Step 5: Solve for x
    x = 387,153.81/709.92
  6. Step 6: Final answer
    x = 545.35

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Double scale
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1.5x scale

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.