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Finding the Fourth Proportional to 979.15, 1,351.25 and 586.39

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Solution

The fourth proportional to 979.15, 1,351.25 and 586.39 is: 809.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.15 : 1,351.25 = 586.39 : x
  2. Step 2: Convert to fraction form
    979.15/1,351.25 = 586.39/x
  3. Step 3: Cross multiply
    979.15x = 1,351.25 × 586.39
  4. Step 4: Simplify right side
    979.15x = 792,359.49
  5. Step 5: Solve for x
    x = 792,359.49/979.15
  6. Step 6: Final answer
    x = 809.23

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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.