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Finding the Fourth Proportional to 979.45, 1,351.60 and 586.69

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Solution

The fourth proportional to 979.45, 1,351.60 and 586.69 is: 809.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.45 : 1,351.60 = 586.69 : x
  2. Step 2: Convert to fraction form
    979.45/1,351.60 = 586.69/x
  3. Step 3: Cross multiply
    979.45x = 1,351.60 × 586.69
  4. Step 4: Simplify right side
    979.45x = 792,970.20
  5. Step 5: Solve for x
    x = 792,970.20/979.45
  6. Step 6: Final answer
    x = 809.61

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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.