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Finding the Fourth Proportional to 521.05, 781.24 and 260.98

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Solution

The fourth proportional to 521.05, 781.24 and 260.98 is: 391.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.05 : 781.24 = 260.98 : x
  2. Step 2: Convert to fraction form
    521.05/781.24 = 260.98/x
  3. Step 3: Cross multiply
    521.05x = 781.24 × 260.98
  4. Step 4: Simplify right side
    521.05x = 203,884.19
  5. Step 5: Solve for x
    x = 203,884.19/521.05
  6. Step 6: Final answer
    x = 391.30

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.