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Finding the Fourth Proportional to 579.78, 868.86 and 290.61

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Solution

The fourth proportional to 579.78, 868.86 and 290.61 is: 435.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.78 : 868.86 = 290.61 : x
  2. Step 2: Convert to fraction form
    579.78/868.86 = 290.61/x
  3. Step 3: Cross multiply
    579.78x = 868.86 × 290.61
  4. Step 4: Simplify right side
    579.78x = 252,499.40
  5. Step 5: Solve for x
    x = 252,499.40/579.78
  6. Step 6: Final answer
    x = 435.51

Related Problems

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.