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Finding the Fourth Proportional to 709.79, 979.47 and 395.03

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Solution

The fourth proportional to 709.79, 979.47 and 395.03 is: 545.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.79 : 979.47 = 395.03 : x
  2. Step 2: Convert to fraction form
    709.79/979.47 = 395.03/x
  3. Step 3: Cross multiply
    709.79x = 979.47 × 395.03
  4. Step 4: Simplify right side
    709.79x = 386,915.14
  5. Step 5: Solve for x
    x = 386,915.14/709.79
  6. Step 6: Final answer
    x = 545.12

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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.