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Finding the Fourth Proportional to 579.90, 869.01 and 290.70

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Solution

The fourth proportional to 579.90, 869.01 and 290.70 is: 435.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.90 : 869.01 = 290.70 : x
  2. Step 2: Convert to fraction form
    579.90/869.01 = 290.70/x
  3. Step 3: Cross multiply
    579.90x = 869.01 × 290.70
  4. Step 4: Simplify right side
    579.90x = 252,621.21
  5. Step 5: Solve for x
    x = 252,621.21/579.90
  6. Step 6: Final answer
    x = 435.63

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.