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Finding the Fourth Proportional to 521.19, 719.38 and 300.21

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Solution

The fourth proportional to 521.19, 719.38 and 300.21 is: 414.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.19 : 719.38 = 300.21 : x
  2. Step 2: Convert to fraction form
    521.19/719.38 = 300.21/x
  3. Step 3: Cross multiply
    521.19x = 719.38 × 300.21
  4. Step 4: Simplify right side
    521.19x = 215,961.47
  5. Step 5: Solve for x
    x = 215,961.47/521.19
  6. Step 6: Final answer
    x = 414.37

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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.