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Finding the Fourth Proportional to 521.70, 720.12 and 353.82

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Solution

The fourth proportional to 521.70, 720.12 and 353.82 is: 488.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.70 : 720.12 = 353.82 : x
  2. Step 2: Convert to fraction form
    521.70/720.12 = 353.82/x
  3. Step 3: Cross multiply
    521.70x = 720.12 × 353.82
  4. Step 4: Simplify right side
    521.70x = 254,792.86
  5. Step 5: Solve for x
    x = 254,792.86/521.70
  6. Step 6: Final answer
    x = 488.39

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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.